Venlafaxine ER Side Effects
What should I watch for?
Tell your doctor if your symptoms do not get better or if they get worse. Visit your doctor or health care professional for regular checks on your progress. Because it may take several weeks to see the full effects of this medicine, it is important to continue your treatment as prescribed by your doctor.
Patients and their families should watch out for new or worsening thoughts of suicide or depression. Also watch out for sudden changes in feelings such as feeling anxious, agitated, panicky, irritable, hostile, aggressive, impulsive, severely restless, overly excited and hyperactive, or not being able to sleep. If this happens, especially at the beginning of treatment or after a change in dose, call your health care professional.
This medicine can cause an increase in blood pressure. Check with your doctor for instructions on monitoring your blood pressure while taking this medicine.
You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this medicine affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells. Alcohol may interfere with the effect of this medicine. Avoid alcoholic drinks.
Your mouth may get dry. Chewing sugarless gum, sucking hard candy and drinking plenty of water will help. Contact your doctor if the problem does not go away or is severe.
Common and Rare Side Effects
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor immediately if any of the following side effects occur:
Lack or loss of strength
fast or irregular heartbeat
mood or mental changes
ringing or buzzing in the ears
Actions that are out of control
itching or skin rash
lightheadedness or fainting, especially when getting up suddenly from a sitting or lying position
problems with urinating or holding urine
severe muscle stiffness
talking, feeling, and acting with excitement that you cannot control
unusually pale skin
Incidence not known
bloody, black, or tarry stools
bloody stool or urine
decreased frequency or amount of urine
general feeling of tiredness or weakness
muscle cramps, spasms, or pain
nausea or vomiting
red or purple spots on the skin
stomach pain on the upper right side
swelling of the face, lower legs, ankles, hands, or fingers
trembling or shaking that is hard to control
unusual tiredness or weakness
vomiting of blood or material that looks like coffee grounds
yellow eyes or skin
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
decrease in sexual desire or ability
loss of appetite
stuffy or runny nose
tingling, burning, or prickly sensations
Change in taste
Incidence not known
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.