Side effects

Medicines and their possible side effects can affect individual people in different ways. The following are some of the side effects that are known to be associated with this medicine. Because a side effect is stated here, it does not mean that all people using this medicine will experience that or any side effect.

Headache

Rash

Dry mouth

Difficulty in sleeping (insomnia)

Drowsiness

Sweating

Muscle weakness

Disturbances of the gut such as diarrhoea, constipation, nausea, vomiting or abdominal pain

Awareness of your heartbeat (palpitations)

Dizziness

Weakness or loss of strength (asthenia)

Weight changes

Nervousness

Sexual problems

Pain in the muscles and joints

The side effects listed above may not include all of the side effects reported by the drug's manufacturer. For more information about any other possible risks associated with this medicine, please read the information provided with the medicine or consult your doctor or pharmacist.

How can this medicine affect other medicines?

Venlafaxine must not be taken at the same time as, or within two weeks of taking a monoamine-oxidase inhibitor antidepressant (MAOI), eg moclobemide. Conversely, a MAOI should not be started until at least one week after stopping venlafaxine. This is because using these medicines together can cause a serious and potentially life-threatening interaction. Cimetidine may cause an increase in the blood level of this medicine, which may cause problems in elderly people or those with impaired liver function. Venlafaxine may alter the anti-blood-clotting effect of anticoagulant medicines, such as warfarin. Blood clotting times should therefore be monitored in people taking anticoagulants if they start or stop taking venlafaxine.

Other medicines containing the same active ingredients

Efexor

Efexor XL

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