Doxycycline Anti-Malarial

Doxycycline malaria tablets are a prescription antibiotic used for the prevention of malaria in adults and children over 12 years of age travelling to regions where the disease is present. Available in a 100mg strength, doxycycline belongs to the tetracycline class of antibiotics and is one of the antimalarial options recommended in current UK travel health guidelines. Malaria is a serious and potentially life-threatening mosquito-borne disease found across parts of sub-Saharan Africa, South and Southeast Asia, Central and South America, and other tropical regions. Planning ahead and speaking to a prescriber about appropriate malaria prevention is an essential part of preparing for travel to affected areas.

Doxycycline is a tetracycline antibiotic with antimalarial properties that is licensed in the UK for the prevention of malaria caused by Plasmodium falciparum, including strains that are resistant to chloroquine. It is one of several antimalarial medicines available for travellers, alongside atovaquone and proguanil (Malarone) and mefloquine (Lariam).

Doxycycline is particularly suited to travellers visiting regions where chloroquine resistance is prevalent, including much of sub-Saharan Africa and parts of Southeast Asia. It is also frequently chosen by long-term travellers and backpackers due to its relatively low cost compared to some alternatives and its suitability for extended use when clinically appropriate.

Doxycycline is a Prescription Only Medicine and is available only following a clinical consultation with a registered prescriber. The choice of antimalarial will depend on your destination, the duration of your trip, your medical history, and any medicines you are currently taking.

Doxycycline acts against the malaria parasite at the blood stage of its lifecycle. Malaria is caused by Plasmodium parasites transmitted to humans through the bite of infected female Anopheles mosquitoes. When an infected mosquito bites, the parasite enters the bloodstream and travels to the liver, where it develops before re-entering the blood and infecting red blood cells.

Doxycycline inhibits the protein synthesis of the Plasmodium parasite by binding to the bacterial ribosomal subunit. This disrupts the parasite’s ability to produce essential proteins, preventing it from replicating effectively. For malaria prophylaxis, consistent daily dosing is essential to maintain adequate blood levels of the medicine throughout the period of exposure to the parasite.

It is important to understand that no antimalarial medicine provides 100% protection against malaria. Doxycycline should always be used as part of a broader malaria prevention strategy that includes mosquito bite avoidance measures such as insect repellent containing DEET, long-sleeved clothing, sleeping under insecticide-treated bed nets, and staying in screened or air-conditioned accommodation where possible.

• Take doxycycline exactly as directed by your prescriber. Do not alter your dose or stop taking it early without speaking to your prescriber first.
• Swallow each capsule whole with a full glass of water. Do not crush or open the capsules.
• Always take doxycycline while sitting upright or standing. Remain upright for at least 30 minutes after each dose to prevent oesophageal irritation.
• Take doxycycline with food or a glass of milk. This helps to reduce the likelihood of nausea and gastrointestinal discomfort.
• Begin taking doxycycline one to two days before entering the malaria risk area. Continue taking it every day throughout your stay in the risk area. Continue for four weeks after leaving the risk area. This four-week continuation period is essential to cover the blood stage of any parasites that may have been acquired towards the end of your trip.
• Take your dose at the same time each day, ideally in the evening with your evening meal, to maintain consistent blood levels and reduce photosensitivity during peak sunlight hours.
• If you miss a dose, take it as soon as you remember. If it is nearly time for your next dose, skip the missed one and carry on as normal. Do not take two doses together.
• Avoid prolonged sun exposure during your course. Doxycycline significantly increases sensitivity to sunlight. Use a high-factor sunscreen, wear protective clothing, and limit direct sun exposure, particularly during the midday hours.
• Do not take doxycycline at the same time as antacids, calcium supplements, iron supplements, or dairy products. These reduce absorption significantly. Separate these from doxycycline by at least two to three hours.

Doxycycline 100mg Capsules
Doxycycline is available as 100mg capsules for malaria prophylaxis.

For malaria prevention in adults and children over 12 years
100mg once daily. Begin one to two days before entering the malaria risk area. Continue daily throughout your stay. Continue for four weeks after leaving the malaria risk area.

The maximum recommended duration of doxycycline for malaria prophylaxis is generally up to two years based on current guidance, though this should be reviewed regularly by a prescriber. If you are planning an extended trip, your prescriber will discuss the most appropriate approach for your individual circumstances.

Doxycycline is not appropriate for malaria prophylaxis in children under 12 years of age or in pregnant women. Alternative antimalarial medicines will be considered for these groups.

As with all medicines, doxycycline can cause side effects, though not everyone will experience them.

Very common side effects (affecting more than 1 in 10 people) include:

• Nausea and vomiting
• Diarrhoea or loose stools
• Abdominal discomfort

Taking doxycycline with food helps to reduce gastrointestinal side effects.

Common side effects include:

• Photosensitivity — significantly increased sensitivity to sunlight, leading to a heightened risk of sunburn even with brief exposure. This is one of the most frequently reported side effects during travel use.
• Headache
• Skin rash or itching
• Oesophageal irritation or ulceration if the capsule does not pass promptly into the stomach

Less common side effects include:

• Vaginal thrush (candidal infection). Long-term antibiotic use can disrupt normal vaginal flora. Speak to your pharmacist if this occurs during your trip.
• Elevated liver enzyme levels
• Changes in blood cell counts

Rare but serious side effects include:

• Severe skin reactions such as Stevens-Johnson syndrome. Seek immediate medical attention if you develop a widespread blistering rash, skin peeling, or sores on the mouth, eyes, or genitals.
• Intracranial hypertension (raised pressure within the skull), presenting as persistent or severe headache and visual disturbance. Contact your prescriber promptly if this occurs.
• Clostridium difficile associated diarrhoea. If you develop severe, persistent, or bloody diarrhoea during or after your course, seek medical advice promptly.

If you experience any unexpected or concerning side effects, stop taking the medicine and seek medical advice. Refer to the Patient Information Leaflet supplied with your medicine for a full list of side effects.

Doxycycline 100mg for malaria prophylaxis is suitable for adults and children aged 12 years and over who are travelling to malaria risk areas.

Doxycycline should not be used by:

• Pregnant women. Doxycycline is contraindicated in pregnancy due to the risk of harm to foetal bone and tooth development. An alternative antimalarial will be recommended for pregnant travellers.
• Breastfeeding women, as doxycycline passes into breast milk.
• Children under 12 years of age. Alternative antimalarial medicines are available for younger travellers.
• Patients with known hypersensitivity to doxycycline, other tetracyclines, or any excipient in the formulation.

Caution is advised in:

• Patients with liver impairment. Doxycycline is metabolised by the liver and should be used carefully where liver function is reduced.
• Patients with myasthenia gravis. Tetracyclines may worsen muscle weakness in this condition.
• Patients taking warfarin or other anticoagulants. Doxycycline may enhance anticoagulant activity. More frequent monitoring of clotting levels may be required.
• Patients taking antiepileptic medicines such as phenytoin, carbamazepine, or barbiturates. These can reduce doxycycline levels in the blood, potentially reducing its effectiveness as malaria prevention.
• Patients taking oral retinoids such as isotretinoin. This combination must be avoided due to increased risk of intracranial hypertension.
• Patients taking antacids, iron, calcium salts, or dairy products at the same time. These must be separated from doxycycline doses by at least two to three hours.

To obtain doxycycline for malaria prophylaxis through Pharmacy Planet, you will need to complete a clinical consultation with one of our registered prescribers. The consultation is the primary step in this process. The prescribing of doxycycline is a possible outcome of that consultation, not a guaranteed one.

During the consultation, the prescriber will review your travel itinerary, destination, trip duration, medical history, and current medicines. They will assess whether doxycycline is the most clinically appropriate antimalarial for your specific trip and circumstances. A prescription will only be issued where the prescriber determines the medicine is suitable and safe for you.

Travel health guidance varies by destination and changes regularly. We strongly recommend also consulting a travel health clinic, your GP, or a specialist travel health pharmacist, particularly for complex itineraries involving multiple countries or high-risk regions. Up-to-date country-specific malaria risk information is available from NHS Fit for Travel and the National Travel Health Network and Centre (NaTHNaC).

Store doxycycline capsules below 25°C in a dry place, away from direct light and moisture. Keep out of reach and sight of children. Do not use after the expiry date printed on the packaging.

When travelling, keep your capsules in their original packaging and store them safely in your hand luggage to ensure continuity of your daily dose. Do not expose them to extreme heat or humidity during travel.

Return any unused or expired capsules to your pharmacy for safe disposal on your return. Do not dispose of medicines via household waste or by flushing them down the drain.

Doxycycline, Lariam (mefloquine), and Malarone (atovaquone/proguanil) are all prescription antimalarial tablets used to prevent malaria in travellers, including in regions where chloroquine-resistant Plasmodium falciparum is present. They differ in their active ingredients, dosing schedules, lead-in times, post-travel continuation periods, and suitability for different patient groups. The table below compares commonly prescribed antimalarial tablets for travel available through Pharmacy Planet.

Important: This comparison is for general information only and does not replace medical advice. A prescriber will decide which treatment is suitable for you following an online consultation.

Pharmacy Planet is a GPhC-registered online pharmacy providing access to a range of prescription travel health and other medicines through a safe, regulated, and discreet service. All consultations are conducted by registered UK prescribers. Medicines are dispensed by our registered pharmacy team and dispatched promptly to support your travel health planning.

We are committed to patient safety and always follow GPHC standards and ASA guidelines on the promotion of prescription medicines. If you have any questions about your antimalarial medicine, your travel health needs, or your consultation, our pharmacy team is available to help.

• Electronic Medicines Compendium. Doxycycline 100mg Capsules — Summary of Product Characteristics. medicines.org.uk/emc. Accessed June 2026.
• NHS Fit for Travel. Malaria Prevention — Chemoprophylaxis. fitfortravel.nhs.uk/advice/malaria. Accessed June 2026.
• British National Formulary. Doxycycline — Malaria Prophylaxis. bnf.nice.org.uk. Accessed June 2026.
• NaTHNaC (National Travel Health Network and Centre). TravelHealthPro — Malaria. travelhealthpro.org.uk/disease/113/malaria. Accessed June 2026.
• Public Health England. Guidelines for Malaria Prevention in Travellers from the UK. gov.uk/government/publications/malaria-prevention-guidelines-for-travellers-from-the-uk. Accessed June 2026.