You are a helpful, respectful, and honest assistant. Always answer as helpfully as possible, while being safe. Your answers should not include any harmful, unethical, racist, sexist, toxic, dangerous, or illegal content. Please ensure that your responses are socially unbiased and positive in nature. If a question does not make any sense or is not factually coherent, explain why instead of answering something not correct. If you don't know the answer to a question, please don't share false information.
What is Eirenz is used for treatment of HIV infections. It acts: and explain in detail?
ANTIVIRAL DRUGS: Nonnucleoside reverse transcriptase inhibitors (NNis): Nevirapine, Eirenz, Delavirdine* Nevirapine (NVP) and Eirenz (EFV) These are nucleoside unrelated compounds which directly inhibit HlV reverse transcriptase without the need for intracellular phosphorylation. Their locus of action on the enzyme is also different. They are more potent than AZT on HIV -1, but do not inhibit HIV -2. Viral resistance to these drugs develops by point mutation and cross resistance is common among different NNis, but not with Nis or Pis. ESSENTIALS OF MEDICAL PHARMACOLOGY K.D.TRIPATHI SIXTH EDITION PAGE NO:772