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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, generic allopurinol next day no prescription 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:

• Gastrointestinal side effects such as nausea, vomiting, weight gain or loss, dry mouth, diarrhea or constipation
• Loss of appetite
• Loss of sleep or insomnia
• Increased sleepiness or drowsiness
• Excessive yawning
• Tremor
• Agitation
• Headache
• Excessive sweating
• Dizziness
• Blurred vision
• Loss of libido, erectile dysfunction

Some of the less common side effects include:

Serotonin syndrome
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.

• Increased tendency to bleed and bruise easily
• Confusion and impaired judgement
• Hallucination
• Weight gain
• Movement disorders such as shaking, or stiffness
• Low blood sodium levels
• Increased suicidal thoughts and behaviors. Those aged under 25 years are more at risk of suicidal thoughts and self-harm behaviors with the use of SSRIs than other age groups.
• Anxiety, restlessness, agitation, aggressiveness and hostility
• Sudden cessation of treatment with SSRIs may also cause withdrawal syndrome

Further Reading

• All Selective Serotonin Reuptake Inhibitor (SSRI) Content
• SSRIs – What are SSRIs?
• Efficacy of SSRIs for Depression
• SSRIs – How They Work
• SSRI Overdose

Written by

Dr. Ananya Mandal

Dr. Ananya Mandal is a doctor by profession, lecturer by vocation and a medical writer by passion. She specialized in Clinical Pharmacology after her bachelor's (MBBS). For her, health communication is not just writing complicated reviews for professionals but making medical knowledge understandable and available to the general public as well.