Aspirin forget to take a day is okay, such as short-term aspirin effect can generally maintain 4 to 6 hours, long-term aspirin for antiplatelet therapy, the effect of the drug can generally be maintained for 5 to 7 days, so missed a meal is generally does not matter, the next time to take on time and according to the amount can be. Aspirin belongs to the antipyretic and analgesic drugs, can be used to relieve mild or moderate pain, can also be used for colds and other febrile diseases such as fever. Aspirin has an inhibitory effect on platelet aggregation, and can also be used to prevent transient ischemic attacks, myocardial infarction, and the formation of blood clots after surgery. Common adverse reactions to aspirin include abdominal pain, gastrointestinal bleeding, and occasionally nausea, vomiting, or diarrhea; consult your doctor promptly if adverse reactions occur. There are some cases are strictly prohibited to take aspirin, such as active ulcer disease or other causes of gastrointestinal bleeding patients, patients with hemophilia or thrombocytopenia, patients with a history of allergy to aspirin, especially patients who have ever had asthma, angioneurotic edema or shock. Before using the drug, you should read the instructions in detail and consult a professional doctor, under the guidance of the doctor to take on time and according to the dosage, if there is a leakage, the next day, according to the dosage can be taken, do not exceed the dosage. If there is any discomfort or adverse reaction, you should go to the hospital in time to avoid delaying your condition.