A Study of Extended-release (ER) Niacin/Laropiprant in Adolescents With Heterozygous Familial Hypercholesterolemia (MK-0524A-158)

Inclusion Criteria: * Post-pubescent adolescent age 10 to 16 with heterozygous familial hypercholesterolemia * Agree to use (and/or have their partner use) acceptable methods of birth control beginning at the prestudy visit until at least 2 weeks after dosing of study drug * Height and weight fall between the 10th and 95th percentile for age with a minimum body weight of 23 kg * Receiving appropriate medical care for hypercholesterolemia, such as a statin or other lipid-modifying therapy. Exclusion Criteria: * History of psychiatric or personality disorders that may affect the patient's ability to participate * History of stroke, chronic seizures, or major neurological disorder * History of clinically significant endocrine, gastrointestinal, cardiovascular, hematological, hepatic, immunological, renal, respiratory, or genitourinary abnormalities or diseases (excluding lipid abnormalities) * Poorly controlled or recently diagnosed Type 1 or Type 2 diabetes mellitus * History of neoplastic disease within previous 5 years * Consumes alcohol or excessive amounts of products that contain caffeine (e.g. cola) * Has had major surgery, donated and/or received blood within previous 8 weeks * Participated in another investigational study within previous 4 weeks * History of significant multiple and/or severe allergies (including latex allergy), or has had an anaphylactic reaction or significant intolerability to prescription or non-prescription drugs or food * Positive for hepatitis B surface antigen, hepatitis C antibodies or human immunodeficiency virus (HIV) * Cannot swallow large tablets * Pregnant or breastfeeding