How to tell if i am having an allergic reaction to this medication?

Rash,swelling,cough: If you have started taking a drug and it gives you any of the following symptoms rash and itching on the body swelling any part of body espacially face runny nose cough and wheezing tightening of throat or airways causing difficulty in breathing anaphylaxis fall in bp, rapid and weak pulse, sweating, tightness in chest nausea vomitind and diarrhea.