HydroxychloroquineSkip to the navigation
Common brand names:Plaquenil
Summary of Interactions with Vitamins, Herbs, & Foods
Replenish Depleted Nutrients
Calcium and Vitamin D
Normally, the active form of vitamin D increases the absorption of calcium into the body. In a 45-year-old woman with sarcoidosis, taking hydroxychloroquine blocked the formation of active vitamin D, which helped normalize elevated blood levels of calcium in this case.1 Whether hydroxychloroquine has this effect in people who don't have sarcoidosis or elevated calcium is unknown. Until controlled research explores this interaction more thoroughly, people taking hydroxychloroquine might consider having their vitamin D and/or calcium status monitored by a health practitioner.
Reduce Side Effects
An individual who took hydroxychloroquine and vitamin B6 together for nine years experienced a complete disappearance of skin nodules caused by rheumatoid arthritis .2 Controlled study is needed to determine whether taking vitamin B6 with or without hydroxychloroquine might help eliminate nodules in people with rheumatoid arthritis.
Magnesium supplementation may reduce blood levels of chloroquine, a compound similar to hydroxychloroquine, and decrease its effectiveness.3 Until more is known, people taking hydroxychloroquine for arthritis who are also using magnesium supplements and are not experiencing relief might try avoiding the supplements or taking them at separate times.
Potential Negative Interaction
1. Barre PE, Gascon-Barre M, Meakins JL, Goltzman D. Hydroxychloroquine treatment of hypercalcemia in a patient with sarcoidosis undergoing hemodialysis. Am J Med 1987;82:1259-62.
2. McCarty DJ. Complete reversal of rheumatoid nodulosis. J Rheumatology 1991;18:736-7.
3. Olin BR, ed. Anti-infectives, Antimalarial Preparations, 4-Aminoquinoline Compounds. In Facts and Comparisons Drug Information. St. Louis, MO: Facts and Comparisons, 1993, 1913-6.
Last Review: 03-18-2015
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