A family of 2 adults and 2 children are going on holiday for 14 days. They have been advised to take malaria tablets for their holiday to prevent them developing the disease. The daily dose for adults is one 100 mg tablet. For children, 25 mg tablets are given based on body weight so that if a child weighs 5–20 kg they take one 25 mg tablet, if they weigh 21–30 kg they take two 25 mg tablets and if they weigh 31–40 kg they take three 25 mg tablets. All daily doses need to start two days before arrival in the malaria-risk area and then continue daily for seven days after leaving the malaria-risk area. The 100 mg tablets come in boxes of 28 tablets and the 25 mg tablets come in boxes of 30 tablets.