If you feel like this for more than a week after starting venlafaxine, tell your doctor. Hypotension A low blood pressure - this can make you feel dizzy. Try not to stand up too quickly. If you feel dizzy, don't drive. This dizziness is not dangerous but you may need to have your blood pressure checked sometimes.
Weight gain A bigger appetite and putting on weight.
A diet full of vegetables and fibre may help prevent weight gain. See also a separate question in this section. Wheeziness When you find it difficult to breathe, and your chest feels tight. Contact your doctor now. Sexual dysfunction Finding it hard to have an orgasm.