Please login to the form below

Not currently logged in
Email:
Password:

Healthcare Glossary

A | B | C | D | E | F | G | H | I | J | K | L | M | N | O | P | Q | R | S | T | U | V | W |

Adverse reaction

An adverse reaction (also known as an adverse effect) is an undesired or harmful effect occurring after taking a medication or receiving surgery. Onset may be sudden or develop over time. If this reaction is minor, it may be referred to as a side effect.

Adverse effects are sometimes referred to as "iatrogenic" because they are generated by a physician or treatment. Occasionally adverse effects occur when starting, increasing or discontinuing a treatment. Using a drug or other medical intervention which is contraindicated
may also increase the possibility of adverse effects. Adverse effects commonly cause medical complications of a disease or procedure and negatively affect its prognosis.

See also:
Adverse event
Contraindication

Pharmacovigilance

COMMENT ON THIS DEFINITIONSUGGEST A NEW TERM

Featured jobs

Subscribe to our email news alerts

PMHub

Add my company
Waggener Edstrom

Waggener Edstrom’s global and European healthcare hub is based in London, and works with experienced teams across the globe; teams...