Seroxat (Paroxetine) Side Effects in Pakistan

A complete guide to Seroxat (Paroxetine) side effects — particularly discontinuation syndrome and pregnancy risks that make this medicine more distinct and require greater caution than other SSRIs.

Compiled by the PakVita Editorial Team · AI-assisted drafting with editorial review · Sourced from DRAP, WHO, BNF · Last updated: 2026-06-17

Side Effects

Quick Answer

Common side effects of Seroxat (Paroxetine) include dry mouth, sedation, nausea, sexual dysfunction, and weight gain. The most notable risks: the most severe discontinuation syndrome among SSRIs (brain zaps, severe dizziness on abrupt discontinuation), pregnancy Category D, and drug interactions via CYP2D6 inhibition (tamoxifen, codeine, tramadol).

Side Effects at a Glance

Common

Nausea
Dry mouth — most anticholinergic among SSRIs
Sedation / drowsiness — most sedating among SSRIs
Constipation — anticholinergic effect
Sexual dysfunction (anorgasmia, delayed ejaculation) — very common
Weight gain
Sweating
Blurred vision — anticholinergic effect

Serious — See a Doctor

Severe discontinuation syndrome — worst among SSRIs: brain zaps, severe dizziness, nausea, electric shock sensations (on abrupt discontinuation)
Serotonin syndrome — with MAO inhibitors or serotonergic drugs (agitation, high fever, tremor — FATAL combination)
QT prolongation / cardiac arrhythmia
SIADH / hyponatraemia — in the elderly
Mania precipitation — in undiagnosed bipolar patients
Cardiac defects — 1st trimester pregnancy (Category D)
Neonatal adaptation syndrome — near term
Bleeding risk — antiplatelet effect
Suicidal ideation — under 25s, first 4 weeks

When to See a Doctor Immediately

Thoughts of self-harm or suicide — call 1122 IMMEDIATELY or go to the nearest emergency
Severe discontinuation symptoms (brain zaps, severe dizziness) if the medicine was stopped — see a doctor IMMEDIATELY; do not stop the medicine yourself
Signs of serotonin syndrome — agitation, high fever, tremor
Irregular heartbeat — IMMEDIATELY
On discovering pregnancy — inform your doctor IMMEDIATELY (Category D)

Seroxat (Paroxetine) Side Effects

Seroxat (Paroxetine) has certain specific risks that distinguish it from other SSRIs — particularly discontinuation syndrome, pregnancy risks, and CYP2D6 drug interactions.

Common Side Effects

Nausea — usually in the first few weeks
Dry mouth — most anticholinergic among SSRIs
Sedation / drowsiness — most sedating among SSRIs
Constipation
Sexual dysfunction (anorgasmia, delayed ejaculation) — very common
Weight gain
Sweating
Blurred vision

These side effects often improve within the first few weeks. Inform your doctor if they are bothersome.

Serious Side Effects

Severe discontinuation syndrome — worst among SSRIs: brain zaps, severe dizziness, nausea
Serotonin syndrome — with MAO inhibitors — IMMEDIATE emergency
Pregnancy Category D — cardiac defects (1st trimester), neonatal adaptation (near term)
CYP2D6 inhibition — tamoxifen, codeine, tramadol — serious consequences
Suicidal ideation — under 25s, first 4 weeks
QT prolongation / SIADH / hyponatraemia

When to See a Doctor

Thoughts of self-harm or suicide — seek help IMMEDIATELY
Brain zaps or severe dizziness (discontinuation) — IMMEDIATELY; do not stop the medicine yourself
Serotonin syndrome signs — IMMEDIATE emergency
Irregular heartbeat — IMMEDIATELY
Pregnancy discovered — see a doctor IMMEDIATELY

Reporting Side Effects

If you notice any unexpected side effect, report it on the DRAP pharmacovigilance portal: https://www.dra.gov.pk/pharmacovigilance

Side Effects Summary Table

Type	Side Effect	Action
Common	Dry mouth / sedation	Monitor / inform doctor
Common	Sexual dysfunction / weight gain	Discuss with doctor
Critical	Discontinuation syndrome	NEVER stop abruptly
Serious	Serotonin syndrome	IMMEDIATE emergency
Serious	Pregnancy Category D	Inform doctor immediately
Serious	Suicidal ideation	IMMEDIATELY call 1122 or see a doctor

The information in this guide is for educational purposes only. If you notice any side effect, contact your doctor or pharmacist.

Frequently Asked Questions

Paroxetine ka discontinuation syndrome kya hota hai?

Paroxetine has the most severe discontinuation syndrome among SSRIs — brain zaps, severe dizziness, nausea, electric shock feelings, and intense anxiety. This is due to paroxetine's short half-life (no self-tapering). Never stop it abruptly.

Kya Paroxetine pregnancy mein safe hai?

No — paroxetine is pregnancy Category D. Cardiac defects in the first trimester are a documented risk, and neonatal adaptation syndrome can occur near delivery. In pregnancy, take it only for life-threatening conditions on a doctor's advice — alternatives (sertraline) are safer.

Paroxetine khane se weight kyun barhta hai?

Paroxetine causes more weight gain than other SSRIs — possibly due to anticholinergic effects, metabolic changes, or increased appetite. Significant weight gain can occur with long-term use. Discuss with your doctor if this is a concern.

Paroxetine aur tamoxifen saath kyun nahin le sakte?

Paroxetine is a potent CYP2D6 inhibitor — it prevents tamoxifen from being converted to its active metabolite (endoxifen). This can cause breast cancer treatment to fail. Avoid paroxetine in cancer patients — sertraline or venlafaxine are safer alternatives.

Paroxetine aur tramadol ke saath kyun dangerous hai?

Paroxetine with tramadol creates a double risk: (1) serotonin syndrome risk because both are serotonergic, and (2) CYP2D6 inhibition affects tramadol's active metabolite. Avoid this combination without a doctor's supervision.

Brand alternatives, same-class options, and other medicines used for the same conditions as Seroxat Tablet.

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Sources

DRAP Registered Products Database — Drug Regulatory Authority of Pakistan
WHO Model List of Essential Medicines, 23rd ed. (2023) — World Health Organization
British National Formulary (BNF) — BMJ Group & Pharmaceutical Press

Medical disclaimer

This page is for educational use only and does not replace professional medical advice. Always confirm diagnosis, dose, and interactions with a qualified doctor or pharmacist before starting or changing any medicine.