• Other cholesterol-reducing drugs. Taking more than one cholesterol reducer at a time may worsen side effects. While physicians often prescribe nicotinic acid in combination with other cholesterol-reducing medications, it is important that such combinations only be attempted under the direction of a physician. Individuals taking cholesterol-reducing drugs should not begin taking niacin supplements before consulting with their physicians.

  • Antihypertensives. Medications to treat high blood pressure. The effects of these medications may be increased in those also taking high dose niacin pills