Interactions

Possible interactions include:

• Hepatotoxic medicines. Taking high doses of vitamin A supplements can cause liver damage. Combining high doses of vitamin A supplements with other medicines that can damage the liver, called hepatoxic medicines, could raise the risk of liver conditions.
• Orlistat (Alli, Xenical). This weight-loss medicine can lower how well the body absorbs food sources of vitamin A. Your healthcare professional might suggest that you take a multivitamin with vitamin A and beta-carotene while taking this medicine.
• Retinoids. Don't use vitamin A supplements and these prescription medicines that are taken by mouth at the same time. This could raise the risk of high levels of vitamin A in the blood.
• Warfarin (Jantoven). Use of vitamin A supplements while taking this medicine used to prevent blood clots might raise your risk of bleeding.