Aspirin is a widely used medication for pain relief, fever, and inflammation. It is also commonly used for preventing heart attacks and strokes in people who are at high risk. The frequency of aspirin use depends on the purpose of its use and the individual's health condition.

For pain relief, aspirin can be taken every 4 to 6 hours as needed, but the maximum daily dose should not exceed 4 grams [1]. However, it is recommended to consult a doctor before taking aspirin for pain relief, especially if the pain is severe or lasts for a long time.

For the prevention of heart attacks and strokes, low-dose aspirin therapy is usually recommended. According to the NHS, low-dose aspirin (75mg) can be taken once a day, preferably at the same time each day [2]. However, it is important to note that not everyone should take aspirin for this purpose, and it is best to consult a doctor before starting any medication.

It is also important to note that aspirin can have side effects, including stomach bleeding, so it is important to follow the recommended dosage and consult a doctor if any side effects occur.

In conclusion, the frequency of aspirin use depends on the purpose of its use and the individual's health condition. For pain relief, aspirin can be taken every 4 to 6 hours as needed, but the maximum daily dose should not exceed 4 grams. For the prevention of heart attacks and strokes, low-dose aspirin therapy is usually recommended, and it can be taken once a day. However, it is important to consult a doctor before starting any medication and to follow the recommended dosage to avoid any potential side effects.

Sources:
[1] https://www.drugpatentwatch.com/p/tradename/ASPIRIN
[2] https://www.nhsinform.scot/tests-and-treatments/medicines-and-medical-aids/types-of-medicine/aspirin
[3] https://www.mayoclinic.org/diseases-conditions/heart-disease/in-depth/daily-aspirin-therapy/art-20046797