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The use of selective serotonin reuptake inhibitors (SSRIs) is associated with several side effects, ranging from mild to severe. While many of these adverse effects improve over time, some may persist and become troublesome, requiring a change of drug.
These drugs act by increasing the synaptic levels of the hormone serotonin - a chemical messenger involved in mood enhancement. This chemical is thought to exist at lower levels in the brains of people with clinical depression, and the use of SSRIs has been shown to benefit such individuals.
However, it may take two to four weeks for SSRI therapy to produce positive effects, during which time the patient may experience side effects but no improvement in depressive symptoms. Patients initiating SSRI treatment are therefore offered counselling to help them persist with the treatment until they begin to experience benefits.
Some of the common side effects encountered include:
Some of the less common side effects include:
This has been linked to regular or overuse of SSRIs, where serotonin levels reach very high levels in the brain. This is usually seen in cases where certain other drugs such as monoamine oxidase inhibitors or St John's wort are taken alongside SSRIs. The side effects of such drug interactions can cause symptoms such as severe agitation, muscle twitching, confusion, shivering, diarrhea, sweating, high temperature, convulsions, irregular heartbeat and loss of consciousness.