Side effects and Adverse effects are always mistaken as the same with common people. But they are both different. Here we will know how.. Adverse effects These are those unintended effects of a drug which are harmful to the body even at therapeutic dose. These effects may also be termed as Averse drug reaction (ADR). An example of ADR is repeated use of Methotrexate which is preferred in treatment of rheumatoid arthritis and psoriasis may cause megaloblastic anaemia even at therapeutic dose. Side effects While side effects are those unintended effects of a drug which are not harmful to the body and rather these effects may be used in treatment of another indication. A very good example of side effect is effect of Promethazine. This is a drug primarily used for treatment of allergies as an anti-allergic agent. But it is also used in prophylaxis or prevention of motion sickness and as a sedative in minor surgeries and also in psychiatry. This was how adverse drug reaction...
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