Highlights for niacin
niacin Side Effects
Side effects that you should report to your doctor or health care professional as soon as possible:
- dark yellow or brown urine
- fainting spells
- grayish stool color
- nausea, vomiting
- severe stomach pain and loss of appetite
- shortness of breath, wheezing
- skin rash and itching
- weakness or tiredness
- yellowing of skin or eyes
Side effects that usually do not require medical attention (report to your doctor or health care professional if they continue or are bothersome):
- stomach discomfort or bloating
niacin May Interact with Other Medications
- medicines for blood pressure, chest pain, or heart disease
- nutritional supplements that contain niacin or nicotinamide
- other medicines to lower cholesterol or triglycerides
How to Use niacin
Take this medicine by mouth with a glass of water. Follow the directions on the prescription label. Do not crush, cut, or chew. Take with a low-fat meal or snack. Take your doses at regular intervals. Do not take your medicine more often than directed. Do not stop taking except on the advice of your doctor or health care professional.
Talk to your pediatrician regarding the use of this medicine in children. Special care may be needed.
They need to know if you have any of these conditions:
- bleeding problems
- frequently drink alcoholic beverages
- liver disease
- ulcers of intestine or stomach
- an unusual or allergic reaction to niacin, other medicines, foods, dyes, or preservatives
- pregnant or trying or get pregnant
If you miss a dose, take it as soon as you can. If it is almost time for your next dose, take only that dose. Do not take double or extra doses.
Visit your doctor or health care professional for regular checks on your progress. You may need regular tests to make sure your liver is working properly.
You may get drowsy or dizzy. Do not drive, use machinery, or do anything that needs mental alertness until you know how this drug affects you. Do not stand or sit up quickly, especially if you are an older patient. This reduces the risk of dizzy or fainting spells.
Do not drink hot drinks or alcohol at the same time you take this medicine. Hot drinks and alcohol can increase the flushing caused by this medicine, which can be uncomfortable. Alcohol also can increase possible dizziness.
This drug is only part of a total heart-health program. Your doctor or a dietician can suggest a low-cholesterol and low-fat diet to help. Avoid alcohol and smoking, and keep a proper exercise schedule.
If you are diabetic, close monitoring of your blood sugars can help your blood fat levels. This medicine may change the way your diabetic medicine works, and sometimes will require that your dosages be adjusted. Check with your doctor or health care professional.
You may notice the empty shell of the tablet in your stool. This is no cause for concern.
Keep out of the reach of children.
Store at room temperature between 20 and 25 degrees C (68 and 77 degrees F). Throw away any unused medicine after the expiration date.
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Last Updated: March 5, 2009