Effexor 37.5, generically known as venlafaxine, can be used to treat depression, anxiety and other psychiatric disorders 23. 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 23.

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If you are experiencing serious medical symptoms, seek emergency treatment immediately.

Gastrointestinal Problems

Many of the side effects that are associated with taking Effexor 37.5 involve the gastrointestinal system, Drugs.com states 123. These include nausea, vomiting, diarrhea, flatulence and constipation. Patients taking Effexor may also develop an upset stomach and experience a decreased appetite 23. Over time, this may result in unintended weight loss.

Chills, Sweating, Fatigue

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Effexor 37.5 can also cause patients to develop chills, eMedTV notes 23. 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 23. 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.

Sexual Problems

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Effexor can also cause diminished libido and sexual desire 23. 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 23. 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 23. In addition, Effexor 37.5 can result in muscle tremors, dry mouth and abnormal tingling or numbness in parts of the body 23.