Introduction: Merex 1000 mg 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 where it works by killing cells in the skin that grow too quickly.

Mode of Action: Methotrexate is an immunosuppressant. In rheumatoid arthritis, it works by decreasing the activity of the body’s immune system. This decreases swelling, reduces pain and stiffness and improves function. In psoriasis, it works by slowing down the rapid growth of skin cells.

Dosage: The doctor will advise the dose and duration of the dosage form. Swallow it as a whole. Do not chew, crush or break it.

Side Effects: The most common side effects of this medicine include nausea, vomiting, loss of appetite, abdominal pain, tiredness, and mouth sores.