Why Is Mefloquine So Hard to Find? [Explained for 2026]

If you've walked into a pharmacy recently looking for mefloquine — the antimalarial medication once widely known under the brand name Lariam — you may have been told it's out of stock. You're not alone, and the problem is real. Since late 2024, mefloquine has been listed as a documented supply shortage by the American Society of Health-System Pharmacists (ASHP) and has been flagged in international travel health advisories as well.

For travelers heading to malaria-endemic regions — sub-Saharan Africa, parts of South America, Southeast Asia, and beyond — this is more than an inconvenience. Finding the right prophylactic medication before departure is a health and safety necessity. Here's what you need to know about why mefloquine is hard to find and what your options are.

What Is Mefloquine and Who Needs It?

Mefloquine is an oral antimalarial prescription drug used to prevent and treat malaria caused by Plasmodium falciparum and Plasmodium vivax. It was originally developed by the U.S. military at the Walter Reed Army Institute of Research and first approved by the FDA in 1989. The brand-name version, Lariam, was discontinued in the U.S. in 2009, leaving only generic formulations on the market.

The drug's primary appeal is its once-weekly dosing schedule. For long-term travelers, aid workers, or military personnel spending weeks or months in malaria-endemic regions, a single weekly tablet is significantly easier to manage than daily alternatives. It is particularly useful for people who cannot tolerate atovaquone-proguanil (Malarone) or doxycycline, or who are pregnant and traveling to high-risk areas where malaria prevention is essential.

Why Is Mefloquine in Short Supply?

The main reason mefloquine is hard to find in 2026 comes down to a single-manufacturer supply chain problem. Teva Pharmaceuticals USA is the primary — and in many markets, only — U.S. generic manufacturer of mefloquine hydrochloride tablets (250 mg). When Teva's supply tightened starting in May 2024, the FDA and ASHP both flagged the drug as in "limited supply." The ASHP shortage bulletin for mefloquine was created on October 9, 2024 and was still being updated as recently as September 2025.

This consolidation of manufacturing into a single supplier is a structural vulnerability in the pharmaceutical supply chain. When one manufacturer faces a production delay, quality issue, or distribution bottleneck, the entire market feels the impact almost immediately. With mefloquine being a relatively low-demand specialty medication compared to drugs like amoxicillin or lisinopril, fewer backup suppliers exist to fill the gap.

Is Mefloquine Still Available Anywhere?

Yes — but availability varies dramatically by pharmacy and region. Major chain pharmacies (CVS, Walgreens, Rite Aid, Walmart, Costco) may have stock at some locations but not others. Travel health clinics and specialty compounding pharmacies are often better sources. The key challenge is that most pharmacies don't publicize their current inventory publicly, which means patients end up calling location after location.

The shortage is also more acute in certain geographic areas. Pharmacies in cities with major international airports and large traveler populations (New York, Los Angeles, Houston, Miami) may cycle through their mefloquine stock faster than rural pharmacies. Travel health clinics tend to maintain better stocks because they specifically serve travelers who need antimalarials.

What Should You Do If Your Pharmacy Is Out of Mefloquine?

Here's a practical action plan if you can't fill your mefloquine prescription:

Call multiple pharmacies before giving up. Don't rely on a single chain's system — call individual locations, particularly independent and specialty pharmacies.

Ask your prescriber about alternatives. Atovaquone-proguanil (Malarone) and doxycycline are both effective for most malaria-endemic destinations and may be easier to find.

Contact travel health clinics. These specialized facilities are more likely to have mefloquine in stock and staff who can evaluate your specific travel itinerary.

Use medfinder to locate it quickly. Instead of calling pharmacies one by one,

Rather than spending hours on hold, medfinder calls pharmacies on your behalf to check which ones have mefloquine in stock near you, then texts you the results. This saves significant time when every pharmacy call is a dead end.

Has Mefloquine Been in Shortage Before?

Yes. Mefloquine has faced intermittent supply disruptions before. The UK's NaTHNaC (National Travel Health Network and Centre) has separately flagged mefloquine shortages in the UK market. In 2024, the Pan American Health Organization estimated that approximately 41 million people live in areas where moderate-to-high malaria risk exists, highlighting the global stakes of antimalarial availability.

The mefloquine shortage is part of a broader pattern of supply chain fragility affecting specialty and lower-volume drugs. Because mefloquine usage has declined over the past two decades (partly due to its serious neuropsychiatric side effects and the rise of alternatives like Malarone), fewer manufacturers have entered the market, creating a single-point-of-failure risk.

When Should You Start Looking?

If you're planning travel to a malaria-endemic region, start the process of obtaining your antimalarial at least 3-4 weeks before departure — and ideally 6-8 weeks ahead. This gives you time to:

Get a prescription from a travel medicine specialist or your primary care provider

Search for mefloquine in stock near you

Switch to an alternative antimalarial if needed, with enough lead time to start the medication correctly (mefloquine prophylaxis must begin 1-3 weeks before you enter a malaria area)

For a detailed step-by-step guide on finding mefloquine at a pharmacy near you, see our companion post: How to Find Mefloquine in Stock Near You (Tools + Tips).

The Bottom Line

Mefloquine is hard to find in 2026 primarily because of a supply shortage affecting the main U.S. generic manufacturer, Teva Pharmaceuticals. The drug exists and can still be found, but it requires checking multiple pharmacies — especially travel health clinics and specialty pharmacies. Start your search early, have a conversation with your prescriber about alternatives, and use tools like medfinder to speed up the search process.