Malaria risk in Zanzibar and when tablets are recommended

Malaria is present in Zanzibar, and the US Centers for Disease Control and Prevention (CDC) recommends that most visitors take antimalarial tablets before, during, and after their trip. The risk is real but not uniform across the islands — it depends on which areas you visit, what time of year you travel, and your personal health history.

The CDC classifies Zanzibar as a malaria transmission area and suggests that travelers discuss tablet options with a doctor or travel clinic at least four weeks before departure. The specific tablet prescribed depends on drug resistance patterns in the region, your age, pregnancy status, and any other medications you take. Common options include atovaquone-proguanil (Malarone), doxycycline, and mefloquine, each with different dosing schedules and side effect profiles.

Not every visitor to Zanzibar will be prescribed tablets — some doctors may recommend them only if you plan to spend significant time in rural areas or visit during the rainy season (April to May and November to December), when mosquito populations peak. However, the safest approach is to consult a travel health provider rather than deciding on your own.

Key Takeaways

  • The CDC recommends antimalarial tablets for most visitors to Zanzibar, though your doctor may adjust this based on your itinerary and health profile.
  • You must see a doctor or travel clinic to get a prescription — antimalarial tablets are not sold over the counter in most countries.
  • Tablets must be started before you arrive in Zanzibar, continued during your stay, and taken for a set period after you leave, so plan your visit at least four weeks ahead.
  • Mosquito prevention — long sleeves, insect repellent with DEET, and bed nets — works alongside tablets and is essential even if you are taking medication.
  • Malaria symptoms can appear weeks or even months after you return home, so report any fever or flu-like illness to your doctor and mention your travel history.

How to get a prescription before you travel

Start by scheduling an appointment with your primary care doctor, a travel medicine clinic, or a pharmacy-based travel health service. Many travel clinics are run by pharmacists trained in travel medicine and can prescribe tablets on the spot. Call ahead and mention that you are traveling to Zanzibar — this allows the clinic to have the right information ready and may speed up your visit.

Bring your passport or a copy showing your travel dates, a list of any medications you currently take, and any allergies or past reactions to drugs. Tell the provider about your full itinerary: whether you are staying in Stone Town (the main city) or venturing into rural areas, how long you will be there, and when you plan to travel. This information shapes whether tablets are recommended and which type is safest for you.

The provider will review malaria risk, your medical history, and any contraindications. If tablets are recommended, you will receive a prescription and instructions on when to start (usually one to two weeks before departure), how often to take them, and when to stop after you return. Ask about side effects — some people experience nausea, dizziness, or vivid dreams — so you know what to expect.

Types of antimalarial tablets and how they work

Atovaquone-proguanil (Malarone) is often a first choice because it has fewer side effects than older drugs and can be started one to two days before travel. You take it daily during your stay and for seven days after you leave. It is more expensive than some alternatives and must be taken with food to be absorbed properly.

Doxycycline is a common antibiotic that also prevents malaria. It is cheaper than Malarone but must be started one to two days before travel and continued for four weeks after you return home. It can cause sun sensitivity, so you will need to use high-SPF sunscreen and avoid prolonged sun exposure. It is not safe during pregnancy.

Mefloquine is taken weekly, starting one to three weeks before travel and continuing for four weeks after. It is effective but has a higher rate of neurological side effects — some people report mood changes, vivid dreams, or anxiety — so it is usually prescribed only when other options are not suitable or when drug resistance is high.

Your doctor will choose based on the drug resistance patterns in Zanzibar, your age, pregnancy status, kidney and liver function, and any psychiatric history. Do not assume one tablet is better than another — the right choice is the one your provider recommends for your specific situation.

Mosquito prevention alongside tablets

Tablets reduce your risk but do not eliminate it. Mosquitoes that carry malaria bite mainly at dusk and dawn, so the most effective prevention combines medication with physical barriers. Wear long sleeves and long pants during dawn and dusk hours, even if you are taking tablets.

Use insect repellent containing at least 20 percent DEET on exposed skin, and reapply after swimming or sweating. Permethrin-treated clothing and mosquito nets treated with insecticide add another layer of protection. If you are staying in a hotel, request a room with air conditioning or screens, and sleep under a bed net if the room is not sealed.

These steps matter because some mosquitoes may carry drug-resistant parasites, and no tablet is 100 percent effective. The combination of tablets, repellent, and physical barriers gives you the best protection.

What happens if you develop symptoms after returning home

Malaria symptoms — fever, chills, headache, muscle aches, and fatigue — can appear weeks or even months after you return. If you develop any of these symptoms, see a doctor when ready and tell them you traveled to Zanzibar. Malaria is treatable if caught early, but delays in diagnosis can be serious.

Your doctor will order a blood test to check for malaria parasites. Be specific about when you traveled and which areas you visited, because this helps the lab know what to look for. If you took antimalarial tablets as prescribed, your risk is lower, but it is not zero — so do not assume a fever is something else just because you took medication.

Frequently Asked Questions

Can I buy antimalarial tablets in Zanzibar instead of bringing them from home?

Antimalarial tablets are available in Zanzibar, but quality and availability vary, and you would be starting medication after you arrive rather than before — which reduces effectiveness. It is safer and more reliable to obtain a prescription from a doctor in your home country before you travel.

Do I need tablets if I am only visiting Stone Town?

Stone Town has lower malaria transmission than rural areas, but the CDC still recommends tablets for most visitors. Your doctor may assess your specific itinerary and health profile and decide tablets are not necessary, but this decision should come from a medical provider, not from your own judgment.

What if I am pregnant or breastfeeding?

Pregnancy and malaria are a serious combination, so prevention is especially important. Some tablets are safe during pregnancy (atovaquone-proguanil is generally considered safe) while others are not (doxycycline is contraindicated). Discuss your pregnancy status with your doctor well in advance so the right tablet can be prescribed.

How long do I need to keep taking tablets after I leave Zanzibar?

The duration depends on which tablet you take. Atovaquone-proguanil requires seven days after departure; doxycycline requires four weeks; mefloquine requires four weeks. Do not stop early — the medication continues to protect you against parasites that may still be developing in your body.

What if I forget to take a tablet while I am in Zanzibar?

If you miss a dose, take it as soon as you remember, unless it is almost time for your next dose. Do not double up. Missing doses reduces your protection, so set a phone alarm or use a pill organizer to help you remember. If you miss multiple doses, contact a doctor or travel clinic for guidance.