Overview

Falciparum malaria

Malaria is a serious parasite infection caused by mosquito bites in tropical countries.

There are different types of malaria. Falciparum malaria is the most serious type. You can die from it if it is not diagnosed and treated quickly.

If you grew up in an area where malaria is common, you might have built up some immunity to malaria. But you can lose this immunity after living in the UK for a while.

Around 2,000 people in the UK get malaria every year. 8 in 10 of these people have falciparum malaria. Most people get the infection when visiting friends and family in other countries.

Symptoms of falciparum malaria

All types of malaria can cause symptoms such as:

  • a high temperature (fever) or chills
  • headache
  • muscle or joint pains
  • a cough
  • diarrhoea
  • feeling or being sick (vomiting)

Falciparum malaria can cause very serious symptoms, such as:

  • confusion
  • feeling very tired and sleepy
  • breathing difficulties
  • peeing less than usual

Diagnosing falciparum malaria

Your nurse or doctor will do a blood test to check if you have falciparum malaria. You’ll usually get the results within 1 day.

Your doctor will tell you if you need to stay in hospital or not. If you do not need to stay in hospital, we’ll prescribe you medicines to take yourself.

Treatment for falciparum malaria

We usually prescribe a medicine called Riamet® to treat falciparum malaria. This contains the ingredients artemether and lumefantrine.

How to take Riamet

Take Riamet together with a fatty meal or a glass of milk. This helps your body absorb the medicine.

Take 4 tablets. This is your 1st dose.

Then, take another dose at the following times:

  • 8 hours after your 1st dose
  • 24 hours after your 1st dose
  • 36 hours after your 1st dose
  • 48 hours after your 1st dose
  • 60 hours after your 1st dose

Take 4 tablets each time.

Important

It’s important you complete the full course of the medicine. Take the medicine as prescribed.

It can take up to 2 days for your symptoms to improve after taking Riamet.

Side effects

Riamet is a safe and common treatment for falciparum malaria. Like all medicines, it can cause some side effects.

The side effects of Riamet include:

  • an irregular heartbeat
  • lowering your red blood cell levels (anaemia)

Important

Read the leaflet inside the medicine packaging for a full list of possible side effects.

When to get help

Call 999 or go to your nearest A&E now if:

  • you’re vomiting less than 1 hour after taking your medicine
  • you’re vomiting the tablets back up – this can stop your medicine from working
  • you’re starting to feel more unwell after leaving hospital
  • you still have a high temperature or chills after finishing your prescribed course of medicine

Follow-up appointments

After you’ve finished treatment, you’ll either have a telephone appointment or a face-to-face appointment at the infectious diseases department.

We’ll make sure that you’ve fully recovered. We might also offer you some screening tests for other infectious diseases.

Preventing malaria

Although you cannot completely prevent yourself from getting malaria again, there are several ways you can reduce the risk.

If you’re travelling to a tropical region that is affected by malaria, ask a GP, pharmacist or travel clinic for advice before you travel.

Do

  • use mosquito repellents containing DEET, especially in the evening
  • wear long trousers and long-sleeved tops to protect your skin from mosquito bites
  • sleep under bed nets treated with insecticide
  • ask a pharmacist for advice about taking antimalarial medicines

Resource number: 2368/VER2
Last reviewed: January 2026
Next review due: January 2029

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