Are there any side effects of nicotinamide?

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Common side effects of nicotinamide (a form of vitamin B3) include diarrhea, headaches, itching, dizziness, upset stomach, nausea and flushing of your skin. Seek immediate medical attention if you develop an allergic reaction, such as difficulty breathing, itching, hives, rash, chest tightness and swelling of your tongue, lips, mouth and face.

Other side effects that require immediate medical attention include bloody stool, dark urine, changes in your vision, loss of appetite, skin numbness or tingling or burning, decreased urination, muscle weakness or pain, irregular or fast heartbeat, persistent nausea, stomach pain, persistent vomiting, swelling of your hands or legs or feet, yellow eyes, yellow skin, feeling unwell, and vomit resembling coffee grounds.

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Important: This content reflects information from various individuals and organizations and may offer alternative or opposing points of view. It should not be used for medical advice, diagnosis or treatment. As always, you should consult with your healthcare provider about your specific health needs.