For a person experiencing the below scenario, he or she is seeing the side effects of the drugs.
What is a Side effect?
A side effect of a medicine or medical therapy is usually unfavourable, the side effect of a medicine is the adverse effect a patient gets asides from the actual purpose of taking the drugs in the first place. The adverse effect may come in form of Sneezing, coughing or a sign showing your body rejects the drugs or medication.
In conclusion, if a person after taking diphendydramine for an allergic reaction, the person begins experiencing drowsiness and a dry mouth, The person is experiencing side effects of the drugs.
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