Effexor is an antidepressant manufactured by Pfizer. It contains venlafaxine as its main active ingredient. It belongs to selective serotonin and norepinephrine reuptake inhibitors (SSNRIs) group of drugs. It acts by affecting unbalanced chemicals in the brain, which are responsible for depression. It is used for treatment of various mental disorders such as depressive disorder, anxiety, and panic disorder. It should be stored at room temperature and must be kept away from moisture and heat. Its overdose could be fatal. Overdose symptoms are vomiting, fast heart rate, blurred vision, extreme drowsiness, or seizure. In case of overdose a patients should immediately call the doctor.

Patients allergic to venlafaxine should not use this medicine. Patients should consult their doctor about their medical history and any medicine in use as it could worsen certain medical conditions or produce side effects by interacting to certain drugs. Patients must be regularly checked by doctor for at least 12 weeks, while taking this medicine as some patients could have suicidal thoughts after first starting an antidepressant, such as Effexor.

It should not be taken along with desvenlafaxine. Patients of bipolar disorder or manic depression, cirrhosis or other liver disease, kidney disease, high blood pressure, glaucoma, seizures or epilepsy, blood disorder or high cholesterol should only use this medicine on prescription of a certified medical prescription, otherwise it could prove fatal for them.

Effexor should not be taken by pregnant or nursing patients, as it could be harmful for unborn baby or feeding infant. Risk is increased if a mother takes this medicine in third trimester of pregnancy. Patients who are planning to pregnant should also avoid this medicine. It should not be given to children as it is meant for adults above 18 years. Consuming alcohol, while using this medicine might increase risk of side effects such as impairment of thoughts or reactions.

It could produce several side effects such as mood changes, anxiety, panic attacks, sleeping problems, impulsiveness, irritability, agitation, hostility, aggressiveness, restlessness, hyperactivity, depression or suicidal thoughts. It could also produce allergic reactions such as skin rash or hives, shortness of breath, swelling of face, lips, tongue, or throat. It could also lead to stiffness of muscles, tremors, hallucinations, trouble in concentration, memory problems and some patients may also experience amnesia. Some patients may also suffer from insomnia after using this medicine.