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On 14 December 2001, GlaxoSmithKline added information to its label regarding withdrawal from Paxil (also sold as Seroxat©). All makers of antidepressants have strenuously denied that their products cause any withdrawal effects, meaning this label change is hugely significant. Here is the text that has been added to the label [emphasis added]:

PRECAUTIONS

General

Discontinuation of Treatment with Paxil: Recent clinical trials supporting the various approved indications for employed a taper phase regimen, rather than an abrupt discontinuation of treatment. The taper phase regimen used in GAD and PTSD clinical trials involved an incremental decrease in the daily dose by 10 mg/day at weekly intervals. When a daily dose of 20 mg/day was reached, patients were continued on this dose for 1 week before treatment was stopped.

With this regimen in those studies,the following adverse events were reported at an incidence of 2% or greater for Paxil and were at least twice that reported for placebo: abnormal dreams (2.3% vs 0.5%), paresthesia (2.0% Vs 0.4%), and dizziness (7.1% Vs 1.5%). In the majority of patients, these events were mild to moderate and were self-limiting and did not require medical intervention.

During Paxil marketing, there have been spontaneous reports of similar adverse events, which may have no causal relationship to the drug, upon the discontinuation of Paxil (particularly when abrupt), including the following: dizziness, sensory disturbances (e.g., paresthesias such as electric shock sensations), agitation, anxiety, nausea, and sweating. These events are generally self-limiting. Similar events have been reported for other selective serotonin reuptake inhibitors.

Patients should be monitored for these symptoms when discontinuing treatment, regardless of the indication for which Paxil is being prescribed. A gradual reduction in the dose rather than abrupt cessation is recommended whenever possible. If intolerable symptoms occur following a decrease in the dose or upon discontinuation of treatment, then resuming the previously prescribed dose may be considered. Subsequently, the physician may continue decreasing the dose but at a more gradual rate (see DOSAGE and ADMINISTRATION).

....

Discontinuation of Treatment with Paxil: Symptoms associated with discontinuation of Paxil have been reported (see PRECAUTIONS). Patients should be monitored for these symptoms when discontinuing treatment, regardless of the indication for which Paxil is being prescribed. A gradual reduction in the dose rather than abrupt cessation is recommended whenever possible. If intolerable symptoms occur following a decrease in the dose or upon discontinuation of treatment, then resuming the previously prescribed dose may be considered. Subsequently, the physician may continue decreasing the dose but at a more gradual rate.

http://www.fda.gov/medwatch/safety/2001/dec01.htm#paxil