Eat acyclovir headache is strong, considering the adverse reaction of the drug, the first should stop the drug, at the same time with analgesic drugs symptomatic treatment. 1. stop using the drug: the adverse reaction caused by the drug, should stop using the drug, and drink more water, eat more vegetables, speed up the metabolism. 2. Analgesic drugs: If the headache is serious, you can take acetaminophen, ibuprofen and other drugs under the guidance of the doctor to relieve pain symptoms. In addition, acyclovir adverse reactions in addition to cause headaches, may also appear allergic reactions, causing systemic erythema, papules and other symptoms, you can follow the doctor’s instructions to use antihistamines anti-allergy treatment, such as chlorpheniramine maleate, cetirizine and so on. It is recommended that patients who have headaches after taking acyclovir stop taking the drug immediately and go to the hospital in time for examination and standardized treatment under the guidance of professional doctors.