Malaria

Malaria is a serious and potentially fatal parasitic disease transmitted to humans through the bite of infected female Anopheles mosquitoes.  Prevalent across large parts of sub-Saharan Africa, South and Southeast Asia, Latin America, and parts of the Middle East and Oceania, it poses a genuine and significant risk to unvaccinated travellers without appropriate chemoprophylaxis.  Unlike many travel health risks, no vaccine is currently available for routine use against malaria in the UK — protection relies on a combination of antimalarial medication and insect bite avoidance measures.

At Jasins Pharmacy in Hounslow, our travel health team offers private malaria prevention consultations and can arrange prescriptions for the most appropriate antimalarial medication for your destination and individual circumstances — no GP referral required.

 

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How Malaria is Transmitted

Malaria is caused by Plasmodium parasites, of which five species are known to infect humans.  Plasmodium falciparum is responsible for the most severe and potentially fatal form of the disease and is the predominant species in sub-Saharan Africa.  Transmission occurs exclusively through the bite of infected female Anopheles mosquitoes, which are most active between dusk and dawn — making evening and overnight exposure periods particularly high risk.

Key factors that increase the risk of malaria transmission include:

• Travelling to or living in sub-Saharan Africa, which accounts for the majority of global malaria cases and deaths
• Visiting rural or forested areas in endemic regions, where mosquito populations tend to be denser than in urban centres
• Being outdoors at dusk and during the night without adequate insect bite protection
• Sleeping in accommodation without air conditioning, window screens, or mosquito nets
• Travelling during the rainy season when standing water increases mosquito breeding grounds
• Visiting friends or family in endemic countries, a group that historically has lower rates of protective behaviour and chemoprophylaxis uptake

 

Importantly, malaria cannot be spread from person to person — a mosquito bite from an infected insect is the only route of transmission.  Previous infection does not confer reliable immunity, and UK travellers visiting endemic regions have no natural protection against the disease whatsoever, making chemoprophylaxis essential for those at risk.

 

Symptoms of Malaria

Recognising the symptoms of malaria — and understanding how quickly the disease can deteriorate — is knowledge that every traveller to an endemic region should have.  Symptoms typically appear between seven and thirty days after an infected mosquito bite, though in some cases they may not develop until several months after returning home.  This delayed onset means that a fever developing weeks or even months after travel should always prompt a malaria test.

Early symptoms of malaria commonly include:

• High fever, often occurring in cycles with chills and sweating
• Severe headache and muscle aches
• Nausea, vomiting, and loss of appetite
• Fatigue and general malaise
• Diarrhoea in some cases

 

Falciparum malaria — the most dangerous form — can progress with alarming speed to severe disease, with potentially fatal complications including:

• Cerebral malaria, causing seizures, impaired consciousness, and coma
• Severe anaemia due to destruction of red blood cells
• Acute respiratory distress syndrome (ARDS)
• Acute kidney failure
• Multi-organ failure and death

 

Anyone who develops a fever within a year of returning from a malaria-endemic region should seek urgent medical attention and specifically mention their travel history.  Delay in diagnosing and treating falciparum malaria can be fatal — this is a medical emergency that requires immediate assessment and treatment.

Antimalarial Medications Available in the UK

Selecting the right antimalarial for your trip requires consideration of your destination, the duration of travel, your medical history, and any other medications you are taking.  Three main antimalarial options are prescribed for UK travellers, each with its own dosing schedule, advantages, and suitability criteria.

• Atovaquone/proguanil (Malarone) — taken once daily, starting one to two days before entering a risk area and continuing for seven days after leaving; well tolerated with fewer side effects than mefloquine; suitable for short trips; not recommended in severe kidney disease or pregnancy
• Doxycycline — a daily antibiotic taken one to two days before travel and continued for four weeks after return; a cost-effective option for longer trips; can cause photosensitivity and gastrointestinal side effects; not suitable for pregnant women or children under twelve
• Mefloquine (Lariam) — taken once weekly, starting two to three weeks before travel and continuing for four weeks after return; suitable for longer trips but associated with a higher rate of neuropsychiatric side effects; not recommended for those with a history of anxiety, depression, psychosis, or seizures
• Chloroquine with proguanil — now rarely recommended due to widespread resistance in most endemic regions; may still be appropriate for a very small number of destinations where drug-resistant malaria is not prevalent; suitability must always be confirmed with a pharmacist based on current NaTHNaC destination guidance

 

Choosing between these options is not a decision to make without professional guidance.  Our pharmacists at Jasins Pharmacy in Hounslow will review your destination, itinerary, health history, and any current medications to identify the most suitable antimalarial for your individual circumstances and arrange a private prescription accordingly.

 

Who Needs Malaria Prevention?

Antimalarial medication is recommended for all travellers visiting regions where malaria transmission is ongoing, regardless of the standard of accommodation, the purpose of travel, or previous trips to the same destination.  UK travellers have no immunity to malaria, and prior exposure does not protect against future infection.

Malaria prevention is particularly important for:

• Travellers visiting sub-Saharan Africa, which carries the highest malaria risk globally and where Plasmodium falciparum predominates
• Those visiting South and Southeast Asia, including India, Pakistan, Bangladesh, Thailand, Vietnam, Cambodia, and Indonesia
• Travellers to Latin America, particularly those visiting jungle or rural areas in countries including Brazil, Peru, Colombia, and Bolivia
• People visiting friends or family in endemic countries, who statistically have lower rates of chemoprophylaxis uptake and are therefore at disproportionate risk
• Pregnant women, for whom malaria poses a particularly serious risk to both mother and foetus and for whom specialist advice on safe chemoprophylaxis options is essential
• Children travelling to endemic regions, as malaria can progress rapidly in young children and appropriate weight-based dosing must be confirmed with a pharmacist

 

Even short trips to high-risk areas carry a significant malaria risk, and the risk is not confined to rural or remote destinations — transmission can occur in urban areas of highly endemic regions.  A travel health consultation at Jasins Pharmacy in Hounslow will confirm the level of risk for your specific destination and ensure you leave with the right protection in place.

 

Antimalarials Alone are Not Enough

Effective malaria prevention requires a dual approach: antimalarial medication combined with consistent insect bite avoidance measures.  No antimalarial provides 100% protection against malaria, and even when taken correctly the medication reduces but does not eliminate the risk of infection.  Bite avoidance therefore remains an essential component of any malaria prevention strategy.

Key insect bite avoidance measures include:

• Applying a DEET-based insect repellent (ideally 50% DEET for high-risk areas) to all exposed skin, particularly from dusk onwards
• Wearing loose-fitting long-sleeved clothing and long trousers in the evenings and at night when Anopheles mosquitoes are most active
• Sleeping under a permethrin-treated mosquito net, even in accommodation with windows and screens
• Using air conditioning or fans where available, as mosquitoes are less active in cool, moving air
• Avoiding outdoor activities at dusk and during the night in high-risk areas where possible

 

Combining chemoprophylaxis with diligent bite avoidance gives travellers the strongest possible protection against malaria.  Our pharmacists at Jasins Pharmacy will discuss both aspects of malaria prevention during your consultation.

 

Possible Side Effects

Side effect profiles vary between the different antimalarial options, and understanding what to expect from your prescribed medication can help you distinguish between medication effects and signs of illness during your trip.

Common side effects by medication include:

• Atovaquone/proguanil (Malarone) — generally well tolerated; possible nausea, stomach discomfort, and headache; taking the tablet with food reduces gastrointestinal side effects
• Doxycycline — can cause photosensitivity (increased risk of sunburn), oesophageal irritation if not taken with sufficient water, and in some cases nausea or diarrhoea; taking it with food and a full glass of water and remaining upright for 30 minutes afterwards reduces the risk of oesophageal side effects
• Mefloquine (Lariam) — associated with a higher rate of neuropsychiatric side effects including vivid dreams, anxiety, dizziness, and sleep disturbance; starting the course two to three weeks before travel allows any significant side effects to be identified before departure

 

Serious adverse reactions to any of these medications are rare but possible.  Our pharmacists will discuss the specific side effect profile of your prescribed antimalarial in detail during your consultation, ensuring you know exactly what to expect and when to seek advice.

Frequently Asked Questions

 

Is there a malaria vaccine available in the UK?

No malaria vaccine is currently available for routine use by travellers in the UK.  RTS,S (Mosquirix) has been approved for use in children in sub-Saharan Africa as part of public health immunisation programmes, but it is not licensed or available for use as a travel vaccine.  Protection for UK travellers continues to rely on antimalarial medication and insect bite avoidance.

How do I know which antimalarial is right for my destination?

The most appropriate antimalarial depends on your specific destination, the duration of your trip, your medical history, and any other medications you are taking.  Our pharmacists at Jasins Pharmacy in Hounslow will review all of these factors during your consultation and recommend the most suitable option based on current NaTHNaC destination guidance.

When should I start taking antimalarial tablets?

Start dates depend on the medication prescribed — Malarone and doxycycline are typically started one to two days before entering a malaria-risk area, while mefloquine should be started two to three weeks before travel to allow time to check for side effects before you depart.  Your pharmacist will provide clear instructions on timing when your prescription is issued.

Do I need to continue taking antimalarials after I return home?

Yes — completing the full course after leaving the malaria-risk area is just as important as taking the medication during your trip, as parasites may still be incubating in the bloodstream after departure.  Malarone should be continued for seven days after leaving the risk area, while doxycycline and mefloquine must be taken for four weeks after return.

What should I do if I develop a fever after returning from a malaria-risk area?

Seek urgent medical attention immediately and specifically inform the doctor or triage team that you have recently visited a malaria-endemic region.  Malaria can develop up to a year after returning home in some cases, and early diagnosis and treatment are essential — do not wait for symptoms to worsen before seeking help.

Are antimalarial tablets safe during pregnancy?

Malaria in pregnancy carries serious risks for both mother and baby, and ideally travel to high-risk malaria regions should be avoided during pregnancy.  Where travel is unavoidable, specialist advice is essential — some antimalarial options such as doxycycline and mefloquine are not recommended during pregnancy, while others may be considered under close medical supervision.

 

Get the Right Malaria Protection Before You Travel

Malaria is a preventable disease, and the right combination of antimalarial medication and bite avoidance can significantly reduce your risk of infection.  Book a malaria prevention consultation at Jasins Pharmacy in Hounslow today and travel to your destination with the protection and confidence you deserve.