If you have an allergic reaction to aspirin rely only on your pharmacist for doctor for information on what is the best drug for you to take for pain. 

Acetaminophen (tylenol) is sometimes described as the 'non-aspirin' pain reliever and it is easier on the stomach. The maximum prescribed dose per day is 4,000 mg but it is safer to stay below as it can effect your liver. It is often used as a substitute for aspirin. 

Ibuprofen is more chemically similar to aspirin and you should stay away from that. Celebrex is often tolerated will in people with aspirin allergies but your first dose should be monitored in a doctors office. 

If you have an aspirin allergy be sure to consult with your physician or pharmacist.