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How does this medication work? What will it do for me?

Venlafaxine belongs to the class of antidepressant medications known as serotonin and norepinephrine reuptake inhibitors (SNRIs). It is used for the treatment of depression. It works on the central nervous system (CNS) to elevate mood in people with depression. Venlafaxine is also used to treat the symptoms of anxiety causing distress in generalized anxiety disorder (GAD), social anxiety disorder (social phobia), and panic disorder (panic attacks) with or without a fear of open spaces. SNRIs work by increasing the amount of two chemicals called serotonin and norepinephrine, which are available in certain parts of the brain.

It may take several weeks before the full beneficial effects of this medication are felt.

Your doctor may have suggested this medication for conditions other than the ones listed in these drug information articles. If you have not discussed this with your doctor or are not sure why you are taking this medication, speak to your doctor. Do not stop taking this medication without consulting your doctor.

Do not give this medication to anyone else, even if they have the same symptoms as you do. It can be harmful for people to take this medication if their doctor has not prescribed it.

What side effects are possible with this medication?

Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent. The side effects listed below are not experienced by everyone who takes this medication. If you are concerned about side effects, discuss the risks and benefits of this medication with your doctor.

The following side effects have been reported by at least 1% of people taking this medication.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.

abnormal dreams
abnormal vision
changes in taste
chills
constipation
diarrhea
dizziness
drowsiness
dry mouth
flushing
headache
heartburn
increased sweating
loss of appetite
menstrual changes
nausea
nervousness
sexual difficulties
stomach pain or gas
tingling, burning or prickly sensation
trembling or shaking
trouble sleeping
unusual tiredness or weakness
vomiting
weight loss
yawning

Check with your doctor as soon as possible if any of the following side effects occur:

changes in vision, such as blurred vision
increase in frequency of urination or amount of urine produced
lightheadedness or fainting, especially when rising suddenly from a sitting or lying position
mood or mental changes
ringing or buzzing in ears
serotonin syndrome - symptoms include:
confusion
diarrhea
fever
poor coordination
restlessness
shivering
sweating
trembling or shaking
twitching
severe abdominal pain
signs of liver damage such as yellowing of the skin and eyes; abdominal pain; dark urine; clay-coloured stools; loss of appetite; or nausea and vomiting
swelling of the hands or feet (if there is no shortness of breath)
trouble holding or releasing urine
unusual or sudden body or facial movements or postures

Stop taking the medication and seek immediate medical attention if any of the following occur:

attempts at suicide or thoughts of suicide
chest pain
convulsions (seizures)
fast or irregular heartbeat
muscle pain or weakness
red or purple patches on skin
reddening, blistering, peeling, or loosening of skin and mucous membranes
signs of an allergic reaction (such as difficulty breathing, hives, swelling of the face or throat)
swelling of the hands or feet with shortness of breath

Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking this medication.

Important Note and Disclaimer
The information provide by World Canadian Pharmacy is intended to supplement, not substitute for, the expertise and judgment of your physician, pharmacist or other health care professional. It should not be construed to indicate that use of the drug is safe, appropriate, or effective for you. The information provided here is for informational purposes only and must not be used or relied upon for making a diagnosis or treatment decision. The information is not intended to cover all possible uses, directions, precautions, drug interactions or adverse effects. Always seek the advice of your physician or other qualified health care provider regarding any questions you may have about a medical condition. Consult your health care professional before using any one of these products, changing your lifestyle, or beginning or discontinuing any course of treatment. If you suspect that you are ill or may have a medical emergency, contact a physician, a health professional or call 911 immediately.