Why do drugs have side effects?

Any drug may produce unwanted or unexpected side effects (also known as an adverse event).
Many side effects are linked to the way the drugs work to treat a patient. For instance, medicines known as beta-blockers treat high blood pressure by acting on particular sites in the muscles of blood vessels, causing the muscles to relax, reducing blood pressure. The medicine, however, also acts on sites in the heart, which may cause a side effect in some patients where their heart beat is slowed down.
Some side effects, however, are not linked in this way and can be unpredictable. As individuals, different patients may respond in different ways to the same drug. For this reason, it is often difficult to predict how different patients will respond to a medicine, including whether they will experience any side effects.

source  www.drugcite.com
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