Effexor XR Side Effects

Effexor XR Drug Info

Effexor XR Side Effects: An Introduction

As with any medicine, there are possible side effects with Effexor XR^® (venlafaxine XR); but, not everyone who takes the medicine will experience side effects. In fact, most people tolerate it well. When side effects do occur, in most cases they are minor and either require no treatment or can easily be treated by you or your healthcare provider.

(This article covers many, but not all, of the possible side effects with Effexor XR. Your healthcare provider can discuss a more complete list of Effexor XR side effects with you.)

Common Side Effects of Effexor XR

Effexor XR has been studied thoroughly in clinical trials.

In these studies, the side effects that occur in a group of people taking the drug are documented and compared to side effects that occur in another group of people not taking the medicine. This way, it is possible to see what side effects occur, how often they appear, and how they compare to the group not taking the medicine.

Based on these studies, the most common side effects of Effexor XR include:

Nausea -- in up to 35 percent of people
Insomnia -- up to 23 percent (see Effexor XR and Insomnia)
Loss of appetite -- up to 20 percent (see Does Effexor XR Have Anorexia Effects?)
Dizziness -- up to 20 percent
Weakness -- up to 17 percent
Drowsiness -- up to 17 percent
Dry mouth -- up to 17 percent (see Effexor XR and Dry Mouth)
Ejaculation problems -- up to 16 percent (see Sexual Side Effects From Effexor XR)
Increased sweating -- up to 14 percent
Nervousness -- up to 11 percent
Constipation -- up to 10 percent
Impotence -- up to 10 percent (see Effexor XR and Impotence)
A decreased sex drive (libido) -- up to 9 percent
Orgasm problems (in women) 8 percent
Abnormal dreams -- up to 7 percent
Weight loss -- up to 7 percent (see Effexor XR and Weight Loss)
Vision changes -- up to 6 percent
Diarrhea -- up to 6 percent.

Other common Effexor XR side effects (occurring in 1 percent to 5 percent of people) include but are not limited to:

Weight gain (see Effexor XR and Weight Gain)
High blood pressure (hypertension)
Vomiting
Shakiness (tremors)
Anxiety
Flushing (redness of the skin, especially the face)
Gas
Agitation
Abdominal pain (or stomach pain)
Depression
Abnormal sensations, such as tingling or pricking (paresthesias)
Yawning
Muscle tension
Belching
Twitching
Sinus infections or irritation.

(Effexor XR Side Effects Continued: Page 2)