Tretinoin is a slightly altered version of vitamin A. Topical tretinoin is available in cream, gel, and liquid forms to treat acne, other skin conditions, and some forms of skin cancer. Tretinoin is also available in oral capsules used to induce remission in people with acute promyelocytic leukemia.
Large amounts of vitamin A can cause side effects, and oral tretinoin can cause similar side effects. Combining vitamin A with oral tretinoin is likely to increase the risk of side effects. People taking oral tretinoin should probably not take more than 10,000 IU of supplemental vitamin A per day.
Last Review: 11-07-2012
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