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Vitamin A: Neomycin: Absorption of Vitamin a possibly reduced by neomycin.
Retinoids: Risk of hypervitaminosis A when vitamin A given with retinoids.
Vitamin D: Barbiturates, carbamazepine, phenytoin, primidone: Vitamin D requirements possibly increased when given with either of the listed medications.
Thiazide diuretics: Increased risk of hypercalcaemia when vitamin D given with thiazide and related diuretics.
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