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Allopurinol, sold under the brand name Zyloprim as well as Lopurin amongst others, is a medication used to decrease high blood uric acid levels. It is specifically used to prevent gout, prevent specific types of kidney stones, and for the high uric acid levels that can occur with chemotherapy. It is taken by mouth or injected into a vein.

Common side effects when used by mouth include itchiness, and rash. Common side effects when used by injection include vomiting and kidney problems. Starting allopurinol during an attack of gout is not recommended; however, continuing the medication is okay[sic]. While use during pregnancy does not appear[sic] to result in harm, this use has not been well studied[sic]. Allopurinol is in the xanthine oxidase inhibitor family of medications.

Most common Lopurin side effects from eHealthme

• Fever - (4,347 reports)
• Thrombocytopenia - (4,071 reports)
• Breathing difficulty - (4,063 reports)
• Fatigue - (4,034 reports)
• Weakness - (4,026 reports)
• Diarrhea - (3,935 reports)
• Nausea - (3,859 reports)
• Anaemia - (3,435 reports)
• Rashes - (3,378 reports)
• Pneumonia - (3,281 reports)

Allopurinol was approved for medical use in the United States in 1966.

On Feb, 07, 2017  76,250 people reported to have side effects when taking Lopurin.  Among them, 367 people (0.48%) have Hallucination

On Feb, 07, 2017  76,250 people reported to have side effects when taking Lopurin.  Among them, 58 people (0.08%) have Hallucination, Auditory

On Jan, 13, 2017  76,250 people reported to have side effects when taking Lopurin.  Among them, 1,977 people (2.59%) have Death