Switching Nevirapine Immediate Release( IR) Based Regimen to Nevirapine Extended Release (XR) Based Regimen in Human Immunodeficiency Virus One (HIV-1) Infected Patients

Inclusion criteria:

HIV infected subjects treated with a Viramune based regimen.

A subject that meets the following inclusion criteria will be eligible for participation in this study:

1. Signed and dated written informed consent prior to admission to the study in accordance with Good Clinical Practice (GCP) and the local legislation.
2. HIV-1 infected males or females of at least 18 years.
3. Treatment with Viramune regimen for at least the preceding 18 weeks.
4. Background therapy with lamivudine/ abacavir(3TC/ABC) (Kivexa® in EU; Epzicom in US), emtricitabine/tenofovir( FTC/TDF) (Truvada) or lamivudine/zidovudine 3TC/AZT (Combivir®).
5. An HIV viral load < 50 copies/mL in preceding 3 months.
6. An HIV viral load of < 50 copies/mL at screening (Visit 1).
7. Acceptable screening laboratory values that indicate adequate baseline organ function with the following exceptions: alanine aminotrnasferase (ALT) and asparatate aminotransferase (AST) < 2.5 × upper limit of normal (ULN) Division of Acquired Immunodeficiency Syndrome (DAIDS Grade 1).
8. Willingness to abstain from ingesting medications that are listed as contraindicated in the Summary of Product Characteristics (SPC) or package insert (or PI) or Investigator's Brochure during the study.
9. Karnofsky performance score of < 70

Exclusion criteria:

Subjects who meet one or more of the following criteria will be excluded from the study:

1. Current treatment with an HIV protease inhibitor
2. Participation in another trial or use of an investigational medicine within two months prior to Day 1 of this study

3. Female patients of child-bearing potential who:

   1. Have a positive serum pregnancy test at screening.
   2. Are breast feeding.
   3. Are planning to become pregnant
   4. Are not willing to use a double-barrier methods (simultaneous use of two different methods such as diaphragm with spermicidal substance and condom) of contraception, or require ethinyl estradiol administration. Barrier methods of contraception include diaphragm with spermicidal substance, condom for females, cervical caps and condoms..
4. Laboratory parameters > DAIDS grade 2 Coagulation prothrombin time (PT), partial thromboplastin time (PTT), International Normalized ratio (INR) Hematology (absolute platelets, white blood cells (WBC), absolute neutrophil count, hemoglobin) Biochemistry (total bilirubin, amylase, serum creatinine, fasting glucose, lactate, alkaline phosphatase)
5. Laboratory parameters > DAIDS grade 3 Total triglycerides (total cholesterol no restriction)
6. Hypersensitivity to any ingredients of the test products
7. Active drug abuse or chronic alcoholism.
8. Hepatic cirrhosis stage Child-Pugh B or C
9. History of severe or acute illness within 60 days prior to Day 1, malignancy or any other conditions which would make the patient, in the opinion of the investigator, unsuitable for the trial
10. Inability to comply with protocol requirements