Side effect of Effexor
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.
changes in taste
loss of appetite
stomach pain or gas
tingling, burning or prickly sensation
trembling or shaking
unusual tiredness or weakness
your doctor as soon as possible if any of the following side
changes in vision, such as blurred vision
increase in frequency of urination or amount of urine
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:
trembling or shaking
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
trouble holding or releasing urine
unusual or sudden body or facial movements or postures
taking the medication and seek immediate medical attention if
any of the following occur:
attempts at suicide or thoughts of suicide
fast or irregular heartbeat
muscle pain or weakness
red or purple patches on skin
reddening, blistering, peeling, or loosening of skin and
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
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.
any other precautions or warnings for Effexor XR?
Be sure to
inform your doctor of all your medical conditions before you
begin taking a medication. Some conditions can affect how you
should take this medication.
HEALTH CANADA ADVISORY
Health Canada has issued new restrictions
concerning the use of Effexor® XR (venlafaxine). To read the
full Health Canada Advisory, visit Health
Canada's web site at
reactions: In rare cases, some people may develop an allergic
reaction to this medication. Signs of an allergic reaction
include a severe rash, swollen face, or difficulty breathing. If
these occur, contact your doctor immediately.
pressure: Treatment with venlafaxine tablets has been associated
with modest increases in blood pressure.
Drowsiness/reduced alertness: People taking venlafaxine should
use caution when driving or operating machinery until they
determine that the medication does not impair their ability to
do such activities safely.
People with glaucoma should have their glaucoma closely
monitored while they are taking this medication.
disease: People with heart disease should be closely monitored
by their doctor while using this medication. Venlafaxine may
cause increased blood pressure or higher cholesterol levels.
liver function: People with reduced kidney or liver function
should be closely monitored by their doctor while using this
Mania/hypomania: Venlafaxine may cause activation of mania or
hypomania. People with a history of bipolar disorder should be
closely monitored by their doctor while using this medication.
As with other antidepressants, people who have had seizures in
the past should be closely monitored by their doctor while
or agitated behaviour: Adults and children taking this
medication may feel agitated (restless, anxious, aggressive,
emotional, and feeling not like themselves), or they may want to
hurt themselves or others. These symptoms may occur several
weeks after people start taking this medication. People should
be closely monitored by their doctor for emotional and
the medication: Stopping this medication suddenly may lead to
side effects. If you are thinking of stopping this medication,
check with your doctor first.
stopping venlafaxine treatment after more than one week, it is
recommended that the dose of the medication be reduced gradually
to prevent symptoms such as anxiety, agitation, confusion,
diarrhea, dizziness, dry mouth, fatigue, headache, nausea, loss
of appetite, nervousness, sleep disturbances, sweating, and
The safety of taking venlafaxine during pregnancy has not been
established. It has been reported that babies born to women who
have taken medications like venlafaxine during the last
trimester of pregnancy may be adversely affected. Physicians and
pregnant women should carefully consider the benefits and the
risks of all treatment options.
Breast-feeding: This medication passes into breast milk. If you
are a breast-feeding mother and are taking venlafaxine, it may
affect your baby. Talk to your doctor about whether you should
The safety and effectiveness of this medication for children
below the age of 18 years have not been established. This
medication is not recommended for use in children under the age
of 18 years. The use of this medication by children below the
age of 18 years may cause behavioural and emotional changes,
such as suicidal thoughts and behaviour.