Methotrexate Injection 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 and tumors in a range of cancers. For psoriasis, it works by killing the cells in the skin that grow too quickly.
Methotrexate Injection is given under the supervision of a healthcare professional and should not be self-administered. It may be used by itself or in combination with other medicines. Your doctor will decide what dose is necessary and how often you need to take it. This will depend on what you are being treated for and may change from time to time. You should take it exactly as your doctor has advised. Taking it in the wrong way or taking too much can cause very 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 as it may increase your risk of liver damage.
The most common side effects of this medicine include nausea, vomiting, loss of appetite, indigestion, abdominal pain, increased liver enzymes, and stomatitis (inflammation of the mouth). 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. It is powerful medicine, and some people may develop serious side effects while taking it. This medicine may lower your ability to fight infections and lead to problems with your blood, liver, or kidneys. Your doctor will advise you on regular blood tests to check for these.
Before taking it, tell your doctor if you are pregnant, have stomach, liver, or kidney problems, or are taking any medicines to treat infections. Many other medicines can affect, or be affected by, this medicine so let your healthcare team know all medications you are using. This medicine is not recommended during pregnancy or while breastfeeding. It may harm your baby. You and your partner should avoid becoming pregnant or fathering a child for several months after your treatment with it has stopped. Your doctor may perform several tests such as blood tests, X-rays, and physical examinations both before and during treatment with this medicine.