The majority of pregnant women do not complain of morning sickness until the 6th week of pregnancy, 2 weeks after a missed period. But for some women, that nagging feeling can start as early as one week after conception, a full week before a missed period. Changes in hormones account for the queasiness that occurs.
DRUG CLASS AND MECHANISM: Niacin (nicotinic acid, vitamin B3) is a part of the normal diet that is essential to various chemical reactions in the body.
A: Niacin, or nicotinic acid, is a B-complex vitamin. Niacin is used with dietary changes, such as a restriction of cholesterol and fat intake, and with or without other medications in people with high cholesterol.: Niacin is a B complex vitamin. Niacin is used to reduce total cholesterol, bad cholesterol and its components (LDL and Apo B) and triglycerides, and to increase good cholesterol (HDL) in patients with cholesterol disorders.