A Study to Evaluate the Effect of Famotidine and Omeprazole on MK0518 (Raltegravir) Pharmacokinetics in Human Immunodeficiency Virus (HIV)-Infected Patients (0518-054)

Inclusion Criteria: * Patient is Human immunodeficiency virus (HIV) positive * Patient is taking an MK0518 (Raltegravir) containing regimen * Patient has not had any changes to his/her antiviral regimen in the last 2 weeks * Patient who is of reproductive potential agrees to use an acceptable method of birth control * Patients baseline health is stable Exclusion Criteria: * Patient has a history of stroke or chronic seizures. * Patient has a history of gastric bypass surgery * Patient is pregnant of breastfeeding * Patient consumes excessive amounts of caffeinated beverages daily * Patient has had major surgery, donated blood, or participated in another investigational study in the past 4 weeks