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Side Effects of Effexor 37.5Mg

author image Adam Cloe
Adam Cloe has been published in various scientific journals, including the "Journal of Biochemistry." He is currently a pathology resident at the University of Chicago. Cloe holds a Bachelor of Arts in biochemistry from Boston University, a M.D. from the University of Chicago and a Ph.D. in pathology from the University of Chicago.
Side Effects of Effexor 37.5Mg
An man suffering from insomnia reaches from his bed to turn off an alarm clock at 6am. Photo Credit AndreyPopov/iStock/Getty Images


Effexor 37.5, generically known as venlafaxine, can be used to treat depression, anxiety and other psychiatric disorders. It belongs to a class of drugs known as serotonin and norepinephrine reuptake inhibitors. It works by increasing the levels of two chemicals in the brain, serotonin and norepinephrine, to help treat psychiatric disorders. Although Effexor 37.5 is generally safe, it can cause some side effects.

Gastrointestinal Problems

Many of the side effects that are associated with taking Effexor 37.5 involve the gastrointestinal system, Drugs.com states. These include nausea, vomiting, diarrhea, flatulence and constipation. Patients taking Effexor may also develop an upset stomach and experience a decreased appetite. Over time, this may result in unintended weight loss.

Chills, Sweating, Fatigue

Effexor 37.5 can also cause patients to develop chills, eMedTV notes. Other notable side effects include increased sweating, which is also known as hyperhidrosis and generalized weakness and fatigue.

Drowsiness, Dizziness, Anxiety

Taking Effexor 37.5 can also result in many changes due to its effects on the nervous system. Common side effects include drowsiness and dizziness. Patients may also paradoxically experience, depression, anxiety or nervousness, even though the medication is often used to treat depression and anxiety.

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Sexual Problems

Effexor can also cause diminished libido and sexual desire. This can also cause orgasms to be impossible or take longer to occur. Men may also experience problems with impotence while taking Effexor 37.5. Many of these sexual side effects can be overcome, however, by making slight modifications in sexual behavior.

Insomnia and Numbness

Effexor can also disrupt a person's ability to sleep, resulting in insomnia and abnormal dreams, RxList reports. In addition, Effexor 37.5 can result in muscle tremors, dry mouth and abnormal tingling or numbness in parts of the body.

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