Anyone with significant medical conditions, anyone pregnant or breastfeeding, and anyone on multiple medications needs a careful review first not because problems are expected, but because limited human data means we don't assume
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Conversely, isoniazid and pyrazinamide (tuberculosis drugs) are structural analogs of niacin that can interfere with niacin metabolism, potentially precipitating pellagra in rare cases
Additionally, if you're taking vitamin B12, some medicines can interfere with your ability to digest it, including: Aminosalicylic acid (Paser), used to treat digestive problems Colchicine (Colcrys, Mitigare, Gloperba) is an anti-inflammatory medicine used to prevent and treat gout Proton pump inhibitors (Prilosec, Prevacid) are used to reduce stomach acid Metformin (Glumetza, Fortamet, others), used to treat diabetes Vitamin C supplements QUESTION See Answer What are the warning signs of vitamin B12 deficiency
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