Leucovorin 15mg Injection is given as a slow injection into veins under the supervision of a doctor. 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.

Injection site reactions (pain, swelling, redness) are common side effects of this medicine. If these bother you or appear serious, let your doctor know. There may be ways of reducing or preventing them. Regular blood tests are required to check your blood cells and serum methotrexate concentration in blood.

Before taking it, tell your doctor if have seizures, 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, especially phenytoin for your seizures. This medicine is not recommended during pregnancy or while breastfeeding.