What is the Average Dosage for Effexor?

Effexor is the brand name for venlafaxine, a prescription antidepressant that is also used in treatment of conditions such as generalized anxiety disorder. Though each patient responds differently to Effexor, there are some established average dosage guidelines that doctors typically follow.

Available Strengths

• Instant release Effexor tablets range from 25 to 100 mg. Effexor XR, an extended-release capsule, is available in 37.5 mg, 75 mg and 150 mg formulations.

Starting Dose

• The average starting dose for depression, GAD and social anxiety disorder is 75 mg, though sometimes doctors have the patient take 37.5 mg for a few days to allow the body to adjust to the medication, according to Effexor.com.

General Dosage

• The average general Effexor dosage ranges from 125 to 150 mg per day, according to the U.S. Food and Drug Administration. Generic instant and extended-release tablets and capsules are available.

Maximum Dosage

• Doctors rarely prescribe more than 375 mg of Effexor each day, according to the FDA. If the drug does not work, the patient will likely be switched to a different antidepressant.

Potential Side Effects

• Side effects that can occur from using either venlafaxine formulation include drowsiness, headache, nightmares, nausea, gas and dry mouth.