January 25, 2021

Effexor Side Effects

As an antidepressant, Effexor works to increase levels of serotonin in the brain. Serotonin is thought to produce feelings of happiness in well-being. In patients with depression, the levels of serotonin are often lower than the general population. Doctors prescribe Effexor to treat major depression, panic disorder and anxiety disorder. Individuals who are allergic to venlafaxine should never take Effexor.

Patients should never take Effexor if they have cirrhosis of the liver, kidney disease, glaucoma, seizures or high blood pressure. Anyone who has recently taken an MAOI should wait at least two weeks before switching to Effexor. This drug can also cause complications if it is taken with desvenlafaxine. Individuals who have a blood clotting disorder, epilepsy, bipolar disorder or high cholesterol should also consult with a doctor before they start taking Effexor.

Side Effects of Effexor

Some people who take Effexor may have an allergy to the drug. Symptoms like rashes, difficulty breathing, hives or a swollen face may be a sign that the patient may have an allergy. In some people who take Effexor, the symptoms of depression may worsen. Individuals may suffer from irritability, aggression, panic attacks, behavior changes, suicidal thoughts or anxiety. If patients experience these symptoms, they should immediately contact a doctor.

Some people who take Effexor have reported headaches, drowsiness, sweating, strange dreams or blurred vision. Effexor can also produce symptoms like stiff muscles, uneven heartbeats, seizures, tremors, or fainting spells. Mentally, patients might find it difficult to concentrate, suffer from memory problems, develop hallucinations or feel agitated. Effexor can produce feelings of weakness, overactive reflexes, diarrhea, nausea, loss of coordination or vomiting.

Overall, side effects and symptoms are rare.

If a patient experiences any of the following side effects, they should immediately contact their doctor or emergency care personnel.

– Easy bruising
– Headaches
– Hallucinations
– Agitation
– Stiff muscles
– Sweating
– Rapid heart rate
– Tremors
– Loss of coordination
– Shallow breathing
– Memory problems
– Issues focusing or concentrating
– Seizure
– Nausea
– Vomiting
– Diarrhea
– Strange dreams
– Sweating
– Feelings of tightness in the chest
– Dry mouth
– Blurred vision
– Changes in appetite
– Drastic weight gains
– Constipation
– Lower sex drive


Women who may become pregnant, are pregnant or are nursing should not take Effexor. Studies show that Effexor can harm the fetus if it is taken during the third trimester. Nursing mothers can also pass Effexor to their child through their breast milk. The FDA lists Effexor in pregnancy category C because it can harm a baby or fetus.

In clinical studies, patients under the age of 24 have reported increased incidence of suicidal thoughts when taking Effexor. If this happens, the patient should immediately visit their doctor. Patients who are taking Effexor should not drink alcohol because it can increase the incidence of symptoms and worsen side effects.

Possible Drug Interactions

Before taking this medication, patients should always tell their doctor if they are taking an allergy medications, muscle relaxers, narcotics, sedatives or medicines for seizures. Patients who take these other medications may feel drowsy and find it difficult to stay awake. Other medications like ibuprofen, indomethacin, piroxicam, naproxen, etodolac, nabumetone and diclofenac can increase the risk of bruising or excessive bleeding. Patients should always tell their doctor about an over-the-counter medication, prescription drugs or herbal supplements that they are on before they start taking Effexor.

There is no effective substitute for a doctor’s advice. Patients should always visit their doctor or a medical practitioner before they start taking any prescription drug. Only a qualified medical practitioner can prescribe Effexor and decide if it is the best choice for the patient. If an individual experiences any side effects or symptoms while taking Effexor, they should immediately visit their doctor or emergency health care professional. Do not take other drugs or drink alcohol while taking this medication without a doctor’s approval.