Before you begin taking a medication, be sure to inform your doctor of any medical conditions or allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should take this medication.
Drowsiness/reduced alertness: This medication may make you drowsy. Use appropriate caution if you plan to do activities requiring alertness.
Gout: Do not start allopurinol treatment until an acute attack of gout has completely subsided, as further attacks may be brought on by this medication. Acute gout attacks may be brought on at the start of treatment with allopurinol for people who have not taken the medication before. If an acute gout attack develops after starting this medication, call your doctor.
Skin rash: If you develop a skin rash, stop taking this medication and contact your doctor. The skin rash may be the first sign of a serious allergic reaction to the medication.
Pregnancy: Allopurinol is not recommended for use by women who are or may become pregnant unless, in the judgment of their doctor, the potential benefits outweigh the possible risks. If you are or may be pregnant, talk to your doctor about the risks and benefits of this medication.
Breast-feeding: Allopurinol is believed to pass into breast milk. Nursing women should not use this medication.
Children: Children should not take allopurinol, except in cases where increased uric acid levels in the blood are associated with cancer or with Lesch-Nyhan syndrome. The safety and effectiveness of allopurinol for this age group have not been established in treatment of other conditions.