Oncotrex 5 Tablet is a medicine used to treat rheumatoid arthritis where it helps prevent further joint damage. It is also used to treat severe forms of a skin disease called psoriasis where it works by killing cells in the skin that grow too quickly. Oncotrex 5 Tablet may be used alone or in combination with other medicines. You should take it exactly as your doctor has advised. Taking too much of it can cause serious side effects. It may take several weeks or months for you to see or feel the benefits but do not stop taking it unless your doctor tells you to. You should avoid drinking alcohol while taking this medicine as it may increase your risk of liver damage. The most common side effects of this medicine include Nausea, vomiting, loss of appetite, abdominal pain, tiredness, and mouth sores. Your doctor may advise you to take folic acid to reduce some of these. If they do not go away or get worse, tell your doctor. There may be ways of preventing or reducing these effects. This medicine may lower your ability to fight infections and lead to problems with your blood, liver, or kidneys. Your doctor may perform several tests such as blood tests, x-rays, and physical examinations both before and during treatment with this medicine to check for these.