The purpose of this study is to evaluate how much and how fast a single, oral, daily 25 mg dose of TMC278 is absorbed into the body when administered as a solution, suspension, granules, or a tablet. In addition, the effect of each formulation of TMC278 will be evaluated in patients in the fasted and fed states and the palatability (how the drug tastes) of each formulation will be assessed. Finally, the safety and tolerability of each formulation of TMC278 will be assessed throughout the study.

This is an open-label (both investigator and volunteer knows the name of the assigned study medication), randomized (study medication will be assigned by chance) cross-over study in healthy adults to compare the rate and the extent of absorption of TMC278 when administered as a single 25 mg dose of the 3 concept pediatric formulations (solution [10 mg/mL], suspension [5 mg/mL], granules [2.5 mg/g]), under fed and fasted conditions, to that when administered as the 25 mg TMC278 Phase III tablet formulation, under fed conditions, in healthy adults and to assess the effect of food on the bioavailability of TMC278 after a single 25 mg dose of the concept pediatric TMC278 formulations in healthy adults. The palatability of the 3 concept formulations will be assessed in a fasted state by use of a questionnaire and a visual analog scale. The short-term safety and tolerability of TMC278 following administration of 3 single oral doses of 25 mg, formulated as one of the concept pediatric formulations (under fed and fasted conditions) and as the Phase III tablet (under fed conditions), in healthy adults will be evaluated. TMC278 25 mg formulated as a solution, suspension, granules, or tablet will be administered orally (by mouth). Each volunteer will receive on the first day of one treatment session one TMC278 25 mg tablet. On the first day of the other sessions they receive a single dose of TMC278 25 mg formulated as a the solution, a suspension or granules.

Inclusion Criteria:

• Non-smoking or smoking no more than 10 cigarettes, or 2 cigars, or 2 pipes per day for at least 3 months prior to selection
• A Body Mass Index (BMI, weight in kg divided by the square of height in meters) of 18.0 to 30.0 kg/m2, extremes included
• Informed Consent Form signed voluntarily before the first trial-related activity
• Able to comply with protocol requirements
• Healthy on the basis of a medical evaluation that reveals the absence of any clinically relevant abnormality and includes a physical examination, medical history, electrocardiogram, vital signs, and the results of blood biochemistry and hematology tests and a urinalysis carried out at screening.

Exclusion Criteria:

• A positive HIV-1 or -2 test at trial screening
• Female, except if postmenopausal since more than two years, or post-hysterectomy or post-tubal ligation (without reversal operation)
• One or more risk factors for QTc prolongation
• Currently active gastrointestinal, cardiovascular, neurologic, psychiatric, metabolic, renal, hepatic, respiratory, inflammatory or infectious disease