Malarone is taken as one tablet daily, starting 1 to 2 days before you enter a malaria-risk area, continuing every day while you’re there, and for 7 days after you leave. That short tail period is one of Malarone’s biggest advantages over other antimalarials, which can require weeks of dosing after your trip. Here’s exactly how to take it so it works properly.
The Daily Schedule
For adults, the standard prophylaxis dose is one adult tablet (250 mg atovaquone / 100 mg proguanil) once per day. Take it at the same time each day to keep drug levels steady in your blood. Setting a daily phone alarm is a simple way to stay consistent, especially across time zones.
Your dosing timeline looks like this:
- Before travel: Start 1 to 2 days before arriving in the malaria-endemic area.
- During travel: One tablet every day you’re in the area.
- After travel: Continue for 7 consecutive days after leaving the area.
Those 7 post-travel days matter. The drug is active against the malaria parasite during the stage when it’s multiplying in your liver and entering your bloodstream. If a mosquito bites you on your last night in the area, the parasite needs time to develop, and those final 7 days of medication catch it before it can cause illness. Stopping early leaves a gap the parasite can exploit.
Always Take It With Food
This is the single most important practical detail. Malarone must be taken with food or a milky drink. The drug’s absorption depends heavily on fat in your meal. Taking it on an empty stomach significantly reduces how much of the active ingredient reaches your bloodstream, which can leave you unprotected even though you’re technically taking the pill every day.
You don’t need a large or greasy meal. A normal breakfast or dinner with some fat content works well: eggs and toast, a sandwich, yogurt, a glass of whole milk. The key is avoiding the empty-stomach scenario, like swallowing the tablet first thing in the morning with just water.
What to Do if You Vomit
If you vomit within 1 hour of taking your dose, take another tablet. The drug likely hasn’t been fully absorbed yet, so that dose essentially didn’t count. If vomiting happens more than an hour after taking it, you don’t need a replacement dose because enough of the medication has already entered your system.
If vomiting is a recurring problem with Malarone, taking it with a fuller meal often helps. Stomach pain, nausea, and vomiting are the most commonly reported side effects, and food reduces all of them.
If You Miss a Dose
Take the missed dose as soon as you remember, then continue your regular schedule. Don’t double up by taking two tablets at once the next day. If you realize you’ve missed multiple days, resume taking it immediately. Gaps in coverage are the most common reason antimalarials fail to prevent infection, so consistency through your trip and the 7-day post-travel period is essential.
Dosing for Children
Children’s doses are based on weight, not age, and use a smaller pediatric tablet (62.5 mg atovaquone / 25 mg proguanil). The schedule is the same: daily, with food, starting 1 to 2 days before travel and continuing 7 days after.
- 5 to 8 kg: Half a pediatric tablet daily
- Over 8 to 10 kg: Three-quarters of a pediatric tablet daily
- Over 10 to 20 kg: 1 pediatric tablet daily
- Over 20 to 30 kg: 2 pediatric tablets daily
- Over 30 to 40 kg: 3 pediatric tablets daily
- Over 40 kg: 1 adult tablet daily
Malarone is not recommended for children weighing less than 5 kg (about 11 pounds). For young children who can’t swallow tablets, the pediatric tablets can be crushed and mixed into a small amount of food, though you’ll want to confirm the best approach with a pharmacist since the taste is bitter.
Who Should Not Take Malarone
Malarone is contraindicated for malaria prevention in people with severe kidney impairment (creatinine clearance below 30 mL/min). If you have known kidney disease, your prescriber will need to choose a different antimalarial. It’s also not recommended for pregnant women or women breastfeeding infants who weigh less than 5 kg.
Side Effects
Malarone is considered one of the best-tolerated antimalarials available. Side effects are rare and, when they occur, tend to be mild: stomach pain, nausea, vomiting, and headache. These are the same symptoms that improve when you take the tablet with food, so that single habit addresses both absorption and tolerability. Unlike some other malaria prevention drugs, Malarone is not associated with vivid dreams, mood changes, or light sensitivity.
How Malarone Works
Malarone contains two active ingredients that work together. The first component targets the malaria parasite’s mitochondria, essentially shutting down the parasite’s ability to produce energy. The second component doesn’t do much on its own, but it dramatically amplifies the first drug’s effect, lowering the concentration needed to kill the parasite. This synergy is why the combination is more effective than either ingredient alone, and it’s also why the two-drug approach helps prevent the parasite from developing resistance.
Because Malarone attacks the parasite during its liver stage (before it enters red blood cells and causes symptoms), it can be stopped just 7 days after your last possible exposure. Other antimalarials like mefloquine or doxycycline only target the blood stage and require 4 weeks of post-travel dosing to catch parasites as they emerge from the liver later.
Malarone for Emergency Self-Treatment
In some situations, a prescriber may give you Malarone as a “reliable supply” for emergency self-treatment if you develop a fever in a remote area far from medical care. The treatment dose is much higher than the prevention dose: 4 adult tablets taken once daily for 3 consecutive days. This regimen is only for emergencies and should not be used if you’re already taking Malarone for daily prevention. If your prescriber gives you Malarone as a backup treatment supply, they’ll typically prescribe a different drug for your daily prophylaxis.