Nolvadex (tamoxifen) can be prescribed for patients diagnosed with breast cancer. It is efficient in both treatment and prevention of this form of cancer and is usually supposed to be taken for a long time - about 5 years depending on each individual case. Unless recommended otherwise by your doctor you are supposed to take this medicine twice a day with some food or without. However, you may be recommended to take this medicine once a day only, so make sure you listen to your health care provider and later observe the dose recommended. Make sure you read the information leaflet that comes with Nolvadex. This way you will be able to learn which side effects are mild and will go away without your doctor's interference (hot flashes, nausea, thinning of hair, depression, headache, increased tumor pain, loss of sexual desire, stomach cramps, constipation, tiredness, weight loss, dizziness etc) and which ones require urgent medical attention. The more serious side effects include muscle weakness, restlessness, swelling, blisters, unusual bruising or bleeding, fever, loss of appetite, vision problems, thirst, rash, and jaundice. If you get any of them or some of them at the same time the first thing you are supposed to do is contact your health care provider who will give you professional advice. Take the exact amount of this drug recommended by your health care provider. If you or someone else may have taken too much of this medicine and experience symptoms such as dizziness, unsteadiness and uncontrollable shaking, seek emergency medical help for you or that other person.