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Aspirin is a painkiller and antipyretic
and is used commonly for headache.It is quite a dangerous drug for 2 reasons:-
-it produces hyperacidity
much faster than any other medicine and can give rise to gastric ulcer causing pain in upper abdomen and internal gastrointestinal bleeding
-Aspirin disables the aggregation of platelets and makes the blood more fluid and if a person who has taken aspirin if he gets injured the bleeding will not stop and he may become serious due excess loss of blood.
So tell your friend that aspirin should be used cautiously and not in very heavy doses like 4-5 tablets for fear of above 2 side effects.As a replacement it will be better to take Paracetamol