Cap: Vit A: Raised plasma levels w/ contraceptive pills. Increased risk of hepatotoxicity w/ chronic excessive alcohol consumption. Reduced gut absorption w/ neomycin. Long-term use or high doses may increase risk of bleeding w/ blood-thinning medications particularly warfarin. GI absorption may be reduced w/ ion exchange resins (eg, cholestyramine) or laxatives (eg, paraffin oil). Vit D
3: Increased GI absorption of Ca. Not to be given w/ paricalcitol, calcipotriene, doxercalciferol, mineral oil, orlistat, & bile acid sequestrants (eg, colesevelam, colestipol, cholestyramine). Increased risk of hypercalcemia w/ benzothiadiazine derivatives (thiazide diuretics). Effect may be diminished w/ anticonvulsants (eg, phenytoin, phenobarb, primidone). Vit B
1: Increased metabolism & blocked formation of thiamine pyrophosphate w/ fluorouracil which could further exacerbate pre-existing thiamine deficiency in cancer patients. Vit B
6: Reduced effects of levodopa. High doses can decrease serum conc of phenytoin & phenobarb. Reduced effectiveness of altretamine (hexamethyl melamine). Vit B
12: Reduced gut absorption w/ aspirin, PPIs, H
2-receptor antagonists, neomycin, & colchicine. Fe: Reduced absorption of & expected hematological response to Fe w/ antacids. Absorption may be reduced w/ beverages high in polyphenolics & may be altered w/ neomycin. Reduced absorption of penicillamine, tetracycline, cefdinir, methyldopa, levodopa, quinolone antibiotics (eg, ciprofloxacin, ofloxacin, norfloxacin & moxifloxacin) & levothyroxine. Buclizine: May enhance sedative effect of nervous depressants including alcohol, barbiturates, hypnotics, narcotics, analgesics, sedatives & tranquilizers. Vit B
12 & Fe: May cause milder, reversible bone marrow depression w/ chloramphenicol. Syr: Patients taking fluorouracil, levodopa, anticonvulsants, altretamine, aspirin, PPIs, H
2-receptor antagonists, neomycin, colchicine, chloramphenicol, antacids, penicillamine, tetracycline, cefdinir, methyldopa, quinolone antibiotics, levothyroxine, & nervous depressants like alcohol, barbiturates, hypnotics, narcotics, analgesic, sedatives, & tranquilizers. Avoid drinking coffee, tea, or red wine while taking this medicine.