Antibiotics for Preppers: Emergency Medical

Medical disclaimer: This article is for educational purposes only. Antibiotics are prescription medications for a reason — incorrect use causes real harm, including life-threatening allergic reactions, antibiotic resistance, and treatment failure from misidentifying the infection. Nothing here constitutes medical advice. Consult a licensed healthcare provider before obtaining, storing, or using any prescription medication. Self-treating with antibiotics carries serious risks and should be considered only when no professional medical care is accessible.

Why Antibiotics Matter in a Long-Term Emergency

Before antibiotics existed, minor infections killed people routinely. A small wound that got infected, an untreated tooth abscess, a case of pneumonia — these were death sentences for a significant portion of the population. Penicillin changed that calculus permanently when it came into widespread use after World War II.

In a functioning medical system, we take antibiotics for granted. A respiratory infection earns you a prescription called into the pharmacy by your doctor. A wound that looks infected gets evaluated same-day and treated the same afternoon. The entire infrastructure of modern medicine is one phone call away.

That changes in a sustained emergency: a grid-down scenario lasting weeks, a major natural disaster that cuts off access to hospitals for days, a remote wilderness situation with a three-day evacuation window. Under those conditions, a bacterial infection that would take a $20 antibiotic prescription to resolve in normal times can progress to sepsis — a life-threatening systemic response — within 48 to 72 hours.

This is the medical preparedness gap that antibiotics address. Not as a replacement for professional medical care, but as a bridge when professional care is genuinely unavailable.

Understanding antibiotics — what they treat, what they do not treat, how to use them responsibly, and how to obtain a legitimate supply — is a core medical preparedness skill.

What Antibiotics Treat — and What They Do Not

This distinction is not a technicality. It is one of the most important concepts in the entire guide, and misunderstanding it causes direct harm.

Antibiotics treat bacterial infections only.

They have zero effect on viral infections. None. A person taking amoxicillin for a cold is getting no therapeutic benefit and actively contributing to antibiotic resistance — a global public health crisis that is already causing treatment failures for previously curable diseases.

Bacterial infections where antibiotics work:

Pneumonia (bacterial — not all pneumonia is bacterial)
Strep throat (caused by Group A Streptococcus)
Urinary tract infections
Skin and soft-tissue infections (cellulitis, wound infections)
Dental abscesses
Ear infections in adults (most pediatric ear infections are viral)
Tick-borne illnesses (Lyme disease, Rocky Mountain Spotted Fever)
Intestinal infections from bacterial pathogens (Salmonella, Campylobacter, certain E. coli strains)
Sexually transmitted infections caused by bacteria (chlamydia, gonorrhea, syphilis)

Viral infections where antibiotics do nothing:

The common cold (rhinovirus, coronavirus, and others)
Influenza (flu)
COVID-19
Most sore throats (roughly 85 to 90 percent are viral)
Most ear infections in children
Most bronchitis in otherwise healthy adults
Stomach “flu” caused by norovirus or rotavirus

The practical challenge: distinguishing bacterial from viral infections in the field, without a lab test, is genuinely difficult. Fever, purulent discharge, and a productive cough with colored sputum are suggestive of bacterial involvement — but not definitive. Strep throat requires a rapid antigen test or throat culture to confirm. Most clinicians use clinical judgment plus context, and they get it wrong a portion of the time even with training and equipment.

This is why self-treating with antibiotics demands honest humility about diagnostic uncertainty. If you cannot be reasonably confident the infection is bacterial, the calculus shifts toward watchful waiting unless symptoms are severe or progressing.

The Legitimate Prescription Route

The most straightforward and legally clean way to have antibiotics available for emergencies is a conversation with your doctor. This conversation is more successful than most people expect, because doctors who treat travelers and outdoor enthusiasts have been having it for decades.

The Travel Medicine Approach

Travel medicine practitioners routinely prescribe “just in case” antibiotic supplies to patients traveling to regions with limited healthcare access — remote trekking destinations, international travel to developing countries, expedition environments. The standard prescriptions are typically a Z-pack (azithromycin, 5-day course) for respiratory coverage and ciprofloxacin for traveler’s diarrhea.

If you travel internationally, camp in remote areas, hunt in wilderness settings, or participate in off-grid activities, this framing is legitimate and honest. Ask your primary care physician or a dedicated travel medicine clinic for a standing prescription for emergency antibiotics, explaining the context. Most physicians will engage seriously with this conversation.

Ask Specifically

Vague requests for “antibiotics just in case” are easier to decline than specific, justified requests. Consider asking:

For a single course of doxycycline 100 mg for tick-borne illness coverage during camping season
For a Z-pack for emergency respiratory coverage if you cannot reach a clinic
For ciprofloxacin in case of severe gastrointestinal illness while traveling

A doctor who understands wilderness medicine or travel medicine will often say yes. A doctor who has not had this conversation before may need more context about your specific activities and access challenges.

Telehealth Options

Several telehealth providers are willing to issue travel-preparedness antibiotic prescriptions after a brief consultation. This is a legitimate route that makes the conversation more accessible, particularly if your primary care relationship is not established or your physician is less familiar with wilderness medicine contexts.

Keep Prescriptions Current

Antibiotics expire and lose potency over time (more on storage below). Plan to refresh your supply every one to three years. The prescription route gives you the ability to do this cleanly and legally.

Fish Antibiotics: The Reality, the Risks, and the FDA Position

No guide on prepper antibiotics would be complete without addressing fish antibiotics — the amoxicillin, doxycycline, ciprofloxacin, and metronidazole sold at aquarium supply stores and online for treating bacterial infections in fish.

The reality is genuinely complicated.

The Composition Argument

Fish antibiotics sold under brand names like Thomas Labs Fish Mox or Fish Flex contain the same active pharmaceutical ingredients as human formulations — amoxicillin 250 mg and 500 mg, doxycycline 100 mg, ciprofloxacin 250 mg and 500 mg. Independent laboratory testing by researchers, including a study published in PLOS ONE in 2018, found that these products generally contain the stated active ingredient in the stated quantity, with acceptable purity levels in many tested samples.

The argument made in prepper circles is therefore: if the molecule is chemically identical and the quantity is stated, what is the meaningful difference?

The Real Risks

Several meaningful differences exist:

No manufacturing oversight. Human pharmaceutical manufacturing operates under FDA Good Manufacturing Practices (GMP) — strict controls on contamination, fill consistency, stability testing, and dissolution rates. Fish antibiotic manufacturers are not held to these standards. A tablet that assays correctly for active ingredient on average may have significant batch-to-batch variation.

No human dosage guarantee. Human antibiotic dosing is calibrated to pharmacokinetic data: how the drug is absorbed, distributed, metabolized, and eliminated in humans. Fish antibiotic labeling provides no human dosing guidance and does not reference human safety data.

No allergy screening or contraindication labeling. Penicillin-class antibiotics (including amoxicillin) cause severe allergic reactions — including anaphylaxis — in roughly 1 in 5,000 to 10,000 administrations. Human prescriptions trigger allergy screening. Fish antibiotics do not.

Regulatory gray area. The FDA has consistently stated that fish antibiotics are not approved for human use. Buying and consuming them is technically at the individual’s own risk, with no legal pathway for accountability if a product causes harm.

The FDA Position

The FDA position is unambiguous: antibiotics marketed for animals are not approved for human use. The agency has increased enforcement efforts around antibiotic sales in recent years. Several previously common fish antibiotic formulations have been withdrawn from the market following FDA action.

Honest Assessment

Fish antibiotics represent a fallback option that some preppers find acceptable under austere conditions where no prescription supply exists and professional medical care is genuinely inaccessible. That calculus is an individual decision. The legitimate prescription route is preferable by a wide margin — safer, legal, and appropriately dosed — and should be pursued first.

If you have explored the prescription route seriously and cannot obtain a supply, the fish antibiotic decision is yours to make with full awareness of the limitations.

Common Broad-Spectrum Antibiotics Worth Understanding

Preppers who pursue antibiotic preparedness generally focus on four to five agents that collectively cover the most likely emergency scenarios. Here is what each one addresses.

Amoxicillin (250 mg or 500 mg)

Amoxicillin is a penicillin-class antibiotic and one of the most commonly prescribed drugs in the world. It is first-line treatment for:

Strep throat
Dental abscesses and tooth infections
Mild community-acquired pneumonia
Ear infections in adults
Skin infections (with appropriate coverage spectrum)
Lyme disease (though doxycycline is preferred)

Dosing (adult): 500 mg three times daily or 875 mg twice daily for most infections. Dental infections typically call for 500 mg three times daily for 5 to 7 days.

Critical note: 5 to 10 percent of people who report penicillin allergy will have a true cross-reaction with amoxicillin. Know your allergy history before stockpiling.

Does not cover: Pseudomonas, MRSA, most respiratory tract pathogens requiring atypical coverage, anaerobic infections.

Doxycycline (100 mg)

Doxycycline is arguably the single most valuable antibiotic for emergency preparedness due to its broad spectrum and coverage of tick-borne illness. It is first-line treatment for:

Rocky Mountain Spotted Fever (treat empirically — delays in treatment are fatal)
Lyme disease
Community-acquired pneumonia and “walking pneumonia” (atypical organisms)
Skin and soft-tissue infections
Chlamydia and other sexually transmitted bacterial infections
Anthrax prophylaxis (one of two standard agents)
Malaria prophylaxis and treatment

Dosing (adult): 100 mg twice daily for most infections. Duration varies by condition: 7 days for RMSF, 10 to 21 days for Lyme, 14 days for most soft-tissue infections.

Critical note: Doxycycline causes significant photosensitivity — users can burn severely in normal sun exposure. It should not be taken with dairy or antacids, which block absorption. It is contraindicated in children under 8 years old and in pregnancy.

Metronidazole (500 mg)

Metronidazole fills a coverage gap that amoxicillin and doxycycline both miss: anaerobic bacteria. These are bacteria that thrive in low-oxygen environments — dental abscesses, abdominal infections, infected wounds with deep tissue involvement.

Key indications:

Dental infections (often combined with amoxicillin for complete coverage)
Abdominal infections
Bacterial vaginosis
Giardia (a waterborne parasite, not a bacterium — metronidazole is active against it)
C. difficile colitis (though resistance is emerging)

Dosing (adult): 500 mg three times daily for most bacterial infections.

Critical note: Metronidazole causes a severe reaction with alcohol — nausea, vomiting, flushing, and rapid heart rate. No alcohol during treatment and for 48 hours after the last dose.

Ciprofloxacin (500 mg)

Ciprofloxacin is a fluoroquinolone with particular utility for gastrointestinal infections and urinary tract infections. It is the antibiotic of choice for:

Traveler’s diarrhea and bacterial gastrointestinal infections
Urinary tract infections, including complicated cases
Anthrax treatment and prophylaxis
Puncture wound infections with risk of Pseudomonas (nail through shoe, for example)
Some respiratory infections

Dosing (adult): 500 mg twice daily for most infections.

Critical note: Fluoroquinolones carry an FDA black-box warning for tendon rupture, particularly the Achilles tendon, in older adults and in people on corticosteroids. They can cause serious central nervous system side effects. Use is generally reserved for infections where first-line agents have failed or are not appropriate — do not use ciprofloxacin as a first-line agent for infections that amoxicillin or doxycycline will cover adequately.

Azithromycin / Z-Pack (250 mg)

Azithromycin is often prescribed as a 5-day course (Z-pack): 500 mg on day one, then 250 mg on days two through five. It covers:

Atypical respiratory infections (“walking pneumonia,” chlamydial pneumonia)
Strep throat (for penicillin-allergic patients)
Some skin and soft-tissue infections
Sexually transmitted bacterial infections

Note: Azithromycin resistance in strep throat has increased significantly in recent years. It is no longer first-line for strep; amoxicillin is preferred when the patient is not penicillin allergic.

Antibiotic Resistance: Why Misuse Is Dangerous

Antibiotic resistance is not an abstract future problem. It is a present crisis. Several previously treatable infections — certain strains of gonorrhea, carbapenem-resistant Klebsiella, MRSA — are already difficult or impossible to treat with standard antibiotics.

The mechanism is straightforward: bacteria reproduce rapidly. When exposed to an antibiotic at sub-lethal concentrations — or when a course is stopped before all bacteria are eliminated — bacteria with natural resistance mutations survive and reproduce while susceptible bacteria die. Over time and across populations, this selects for resistant strains.

The specific behaviors that drive resistance:

Not completing the full course. This is the most common and consequential error. Symptoms improve when bacterial load drops below the threshold that drives an immune response — typically around day three to four of treatment. But the infection is not eradicated. Bacteria that survive that partial course are, by definition, more resistant than those that died first. Take the full prescribed course even after you feel better.

Using antibiotics for viral infections. No therapeutic benefit. Pure resistance pressure with zero upside.

Under-dosing. Taking less than the prescribed dose produces sub-lethal antibiotic concentrations — exactly the condition that selects for resistance.

Using old or degraded antibiotics. Potency-degraded antibiotics function as sub-lethal doses even when taken at full tablet count. This is part of why storage and expiration management matter.

In a grid-down scenario, antibiotic resistance has personal stakes beyond the public health framing: if you misuse your antibiotic supply and create a resistant infection, there is no second-line agent available to you. Reserve antibiotics for genuine bacterial infections, use full courses, and dose correctly.

Storing Antibiotics: Temperature, Expiration, and the Potency Question

Antibiotics are medications, and medications degrade. Storage decisions directly affect whether a stockpiled antibiotic is therapeutic or useless when you need it.

Temperature Sensitivity

Most oral antibiotics are stable at room temperature (59 to 77°F / 15 to 25°C). The rules:

Store cool and dry. Heat and humidity accelerate degradation. A medicine cabinet in a steam-producing bathroom is one of the worst storage locations in a home. A cool, dark, dry location — interior closet shelf, basement cabinet — extends shelf life.
Avoid freeze-thaw cycles. Freezing and thawing accelerates breakdown in some formulations.
Liquid suspensions are far less stable than tablets. Pre-mixed amoxicillin suspension (the pink liquid for children) must be refrigerated and discards after 10 to 14 days. Tablets and capsules are the appropriate format for long-term storage.
Doxycycline is particularly sensitive to heat, light, and humidity. Store in original packaging or airtight containers, away from light. Degraded doxycycline has been associated with kidney toxicity — this is one antibiotic where storage conditions matter more than most.

Expiration Dates and the 1% Rule

The FDA requires pharmaceutical manufacturers to establish expiration dates based on stability testing — the date by which the manufacturer guarantees at least 90 percent of labeled potency remains. This is a conservative commercial standard, not a cliff at which medications suddenly become inert.

The FDA’s own Shelf Life Extension Program (SLEP), which tests military pharmaceutical stockpiles, found that the vast majority of medications — including most antibiotics — retain full or near-full potency well beyond their labeled expiration dates when stored correctly. Some lots retained potency for 10 to 15 years beyond expiration.

The practical framework: properly stored tablet and capsule antibiotics are almost certainly still substantially effective one to three years past expiration, and may remain useful significantly longer. Degradation is typically gradual, not sudden. The risk is reduced potency — less effectiveness at treating an infection — not toxicity (with the notable exception of tetracyclines including doxycycline, where degradation products can theoretically cause harm; keep doxycycline rotated more aggressively).

The 1% rule of thumb used in wilderness medicine circles: antibiotic potency typically degrades at roughly 1 percent per year under good storage conditions — a guideline, not a hard pharmacological fact, but a reasonable working assumption for planning purposes.

Practical storage protocol:

Rotate stock every one to two years when possible (use and replace)
Store in original manufacturer packaging inside airtight containers
Use oxygen absorbers and desiccant packets in long-term storage containers
Keep a written log of antibiotic identity, dosage, lot number, and expiration date
Prioritize replacing doxycycline more frequently than other agents

Signs of Serious Bacterial Infection Requiring Antibiotics

In the field, without lab tests, clinical judgment is your only diagnostic tool. These are the signs that warrant strong consideration of antibiotic treatment:

High fever (above 103°F / 39.4°C). A temperature in this range associated with an obvious infection source — an infected wound, dental abscess, respiratory illness with productive cough — strongly suggests bacterial involvement. Viral infections can produce high fevers too, so fever alone is not diagnostic, but fever combined with other bacterial signs shifts the probability.

Spreading redness (cellulitis). The classic sign of bacterial skin and soft-tissue infection. Redness, warmth, and swelling expanding outward from a wound or insect bite over 24 to 48 hours is bacterial until proven otherwise. Mark the margin with a permanent marker and check again in 4 to 6 hours — progressive expansion means the infection is advancing.

Red streaking from a wound (lymphangitis). Linear red streaks extending from an infected site toward the body’s center are tracking along lymphatic channels. This is a systemic escalation — the infection is spreading beyond the local tissue. This finding requires antibiotics immediately and urgent evacuation planning. Do not wait.

Purulent discharge. Yellow, green, or cloudy drainage from a wound or mucous membrane suggests active bacterial infection. Clear serous drainage is normal in the first 24 to 48 hours of wound healing; purulence is not.

Systemic symptoms with an obvious infection focus. Fever, chills, rapid heart rate, and general deterioration in a patient with a known wound, dental problem, or respiratory illness suggests the infection is driving systemic effects. This is early sepsis territory — treat aggressively and plan evacuation.

Dental abscess with swelling. Dental infections can spread rapidly into the fascial planes of the jaw and neck — Ludwig’s angina, a rapidly spreading cellulitis of the floor of the mouth, can compromise the airway and is a surgical emergency. Any dental abscess with expanding facial swelling warrants antibiotics (amoxicillin plus metronidazole covers the polymicrobial flora of dental infections well) and urgent evacuation.

When NOT to Use Antibiotics

This section matters as much as the one above. Inappropriate antibiotic use is not a neutral act — it drives resistance, disrupts your gut microbiome, and can cause direct side effects including Clostridioides difficile (C. diff) colitis, a serious diarrheal illness triggered by antibiotic disruption of normal intestinal flora.

Do not use antibiotics for:

The common cold. Rhinovirus, coronavirus, and other upper respiratory viruses do not respond to antibiotics. A runny nose, sore throat, and general malaise lasting 7 to 10 days with no fever above 101°F is almost certainly viral. Rest, hydration, and over-the-counter symptom management are the appropriate treatment.

Influenza. The flu is a viral illness. Antibiotics are not indicated unless a secondary bacterial pneumonia develops — a genuine complication that presents with high fever, worsening after initial improvement, and productive cough with colored sputum.

COVID-19. A coronavirus. Antibiotics have no effect on the virus. Secondary bacterial pneumonia as a complication of COVID would warrant antibiotics, but the primary illness does not.

Most sore throats. Roughly 85 to 90 percent of sore throats in adults are caused by viruses. Strep throat — caused by Group A Streptococcus — represents perhaps 10 percent of adult sore throats and requires a rapid antigen test or culture to confirm. Clinical clues suggesting strep rather than viral pharyngitis: high fever (above 101°F), absence of cough, swollen anterior cervical lymph nodes, white patches on tonsils (the Centor criteria). Even then, misdiagnosis without a test is common.

Most ear infections in children. Guidelines from the American Academy of Pediatrics recommend watchful waiting for most acute otitis media (middle ear infections) in children over 2 years old, because the majority resolve without antibiotics. Adult ear infections more commonly warrant treatment.

Most bronchitis in healthy adults. The productive cough and chest congestion of acute bronchitis in an otherwise healthy person is almost always viral. Antibiotics do not shorten duration or reduce symptoms.

The field heuristic to hold onto: if you are not reasonably confident an infection is bacterial, if symptoms are not severe, and if the patient is not deteriorating — watchful waiting is the appropriate first response in most cases.

Wilderness Medicine Resources

Antibiotics are one tool in a broader field medicine framework. The knowledge to use them well — patient assessment, differential diagnosis under uncertainty, infection monitoring, evacuation decision-making — comes from training, not just reading.

Two organizations set the standard for wilderness medicine education:

NOLS Wilderness Medicine (nols.edu/wmi) offers courses from the 16-hour Wilderness First Aid (WFA) level through the 70 to 80-hour Wilderness First Responder (WFR) certification and the professional-level Wilderness Emergency Medical Services (WEMS) program. NOLS courses are widely recognized as the gold standard.

Wilderness Medical Associates (wildmed.com) is another top-tier certifying organization with courses available throughout the US and internationally. WMA’s WFR curriculum includes substantial pharmacology content, including antibiotic decision-making in remote settings.

Wilderness First Responder certification is the level that provides meaningful antibiotic decision-making competency. The WFR curriculum includes patient assessment systems, infection identification and monitoring, evacuation criteria, and in some jurisdictions includes medication administration protocols. If you intend to maintain an antibiotic supply for genuine emergency use, WFR training gives you the clinical framework to use that supply effectively.

For a comprehensive overview of wilderness medicine as a discipline, the training levels, and what each certification covers, see the wilderness first aid guide. Your emergency medical preparedness planning should also include antibiotics as part of a broader medical supplies and skills framework.

Building Your Emergency Antibiotic Plan

Antibiotic preparedness does not require building an illicit supply or making risky decisions. It requires three things: a realistic assessment of your risk profile, a proactive conversation with your healthcare provider, and sound storage and rotation practices.

Step 1: Define your exposure profile. Are you preparing for short-duration emergencies where access to a pharmacy within 24 to 48 hours is realistic? Or are you planning for extended grid-down scenarios, remote property access, or international travel to genuinely underserved areas? Your scenario drives your supply requirement.

Step 2: Have the prescription conversation. Schedule an appointment with your primary care physician or a travel medicine specialist. Come prepared: describe your specific activities, your remote access challenges, and what you are asking for. A single course each of doxycycline and amoxicillin is a reasonable starting request. Document any allergies and contraindications during that conversation.

Step 3: Learn to recognize bacterial infections. The signs in this guide are a starting framework. Formal wilderness first aid training gives you the patient assessment skills to apply clinical judgment under pressure.

Step 4: Store correctly and rotate. A properly stored antibiotic supply is a meaningful resource. An improperly stored or expired supply is false security. Implement the storage protocol above and plan for annual review of your medical supplies.

Step 5: Pair antibiotics with a reference. The Wilderness Medicine Handbook (Wilderness Medical Associates) and Where There Is No Doctor (Werner et al.) both include antibiotic protocols appropriate for austere settings. Keep a printed reference with your medical kit so dosing and indication decisions are not dependent on memory under stress.

The goal is not to replace the medical system — it is to bridge the gap when that system temporarily cannot reach you. Used responsibly, with proper training and a realistic understanding of their limitations, antibiotics are one of the highest-value medical preparedness investments a prepper can make.

Quick Reference: Antibiotic Summary

Antibiotic	Primary Uses	Adult Dose	Key Caution
Amoxicillin 500 mg	Strep, dental, mild pneumonia, ear	500 mg 3x daily	Penicillin allergy risk
Doxycycline 100 mg	Tick-borne illness, respiratory, skin, STIs	100 mg 2x daily	Photosensitivity; avoid in pregnancy and under age 8
Metronidazole 500 mg	Dental abscess, anaerobic infections, giardia	500 mg 3x daily	No alcohol during or 48 hours after
Ciprofloxacin 500 mg	UTI, GI infections, anthrax, Pseudomonas risk	500 mg 2x daily	Tendon rupture risk; reserve for appropriate indications
Azithromycin (Z-pack)	Atypical respiratory, penicillin-allergic strep	500 mg day 1, 250 mg days 2-5	Increasing strep resistance

Medical Supplies to Pair With Antibiotics

Antibiotics work better when paired with wound care, infection monitoring, and the skills to recognize when evacuation is needed over field treatment. Your home first aid kit should include:

Thermometer for fever monitoring
Permanent marker for tracking cellulitis margins
Wound care supplies for irrigation and dressing
Written antibiotic protocols and dosing reference
Allergy documentation for every household member

Antibiotics are one layer of emergency medical preparedness. The full framework — kit tiers, trauma skills, evacuation decision-making — is covered in the emergency medical preparedness guide.

Frequently Asked Questions

How can preppers get antibiotics without a prescription?

The best path is a direct conversation with your primary care physician. Frame it as travel preparedness or remote wilderness access — doctors routinely prescribe a short course of doxycycline or azithromycin for travelers going to areas without reliable medical care. Some telehealth providers also issue emergency antibiotic prescriptions. Outside the US, many countries sell antibiotics over the counter at pharmacies — travelers sometimes stock up legally while abroad. Fish antibiotics from aquarium suppliers remain a controversial gray area: the active ingredients are often chemically identical to human formulations, but they are not FDA-regulated for human use, carry no dosage guarantee, and the legal and safety picture is murky. The legitimate prescription route is always preferable.

What antibiotics should preppers stockpile?

If you can obtain prescriptions, the most useful broad-spectrum antibiotics for emergency preparedness are: doxycycline (covers respiratory infections, tick-borne illness, skin and soft-tissue infections, and some STIs), amoxicillin (dental infections, ear infections, strep throat, mild pneumonia), metronidazole (anaerobic bacterial infections, dental abscesses, giardia, C. diff), and ciprofloxacin (urinary tract infections, gastrointestinal infections, puncture wounds at high risk for Pseudomonas). A Z-pack (azithromycin 5-day course) rounds out coverage for atypical respiratory infections. Most preppers should focus on doxycycline and amoxicillin as the highest-value starting point, since they cover the most likely emergency scenarios.