Adverse Effects
The most common adverse effects include: ulcerative stomatitis, low white blood cell count and thus predisposition to infection, nausea, abdominal pain, fatigue, fever, dizziness, acute pneumonitis and rarely pulmonary fibrosis.
Methotrexate is a highly teratogenic drug and categorized in pregnancy category X by the FDA. Women must not take the drug during pregnancy, if there is a risk of becoming pregnant, or if they are breastfeeding. To engage in any of these activities (after discontinuing the drug), women must wait until the end of a full ovulation cycle.
Central nervous system reactions to methotrexate have been reported, especially when given via the intrathecal route which include myelopathies and leucoencephalopathies. It has a variety of cutaneous side effects, particularly when administered in high doses.
Generally, the more "nonspecific" action a pharmacological substance has, the more possible side effects can be expected. Methotrexate has, like all cytotoxic substances, a broad array of possible adverse effects. Care should always be taken to read the manufacturer's original instructions for the preparation in question.
Read more about this topic: Methotrexate
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