Antiretroviral Therapy — Principles & Adherence
A single missed dose of antiretrovirals doesn't just skip treatment — it hands HIV a blueprint for resistance. Understanding HAART principles explains why adherence is the entire ballgame.
Core Concept
Highly Active Antiretroviral Therapy (HAART) uses a combination of at least three drugs from at least two different classes to suppress HIV replication to undetectable levels (viral load <200 copies/mL). The rationale for combination therapy is resistance prevention: HIV mutates rapidly, and using a single agent allows resistant strains to emerge within days. Multiple drugs targeting different steps in the viral life cycle — reverse transcription, integration, protease-mediated maturation, viral entry — make it exponentially harder for the virus to develop simultaneous resistance mutations. HAART does not cure HIV; it suppresses viral replication so the immune system can recover, reflected by a rising CD4 count. Treatment is initiated at diagnosis regardless of CD4 count per current guidelines. The goal is an undetectable viral load within 3–6 months. Adherence must exceed 95% to maintain suppression — missing more than one dose per month of a once-daily regimen drops below this threshold. The nurse monitors two key labs: CD4 count (immune function, goal >500 cells/mm³) and viral load (treatment effectiveness, goal undetectable).
Watch Out For
Don't confuse HAART principles (why combination therapy, adherence rationale, treatment goals) with individual drug class side effects — that's the sibling atom. Students often think HAART is started only when CD4 drops below a threshold; current guidelines recommend starting at diagnosis. Undetectable viral load does NOT mean cured — the client remains HIV-positive and must continue therapy lifelong.
Clinical Pearl
Three drugs, two classes, one goal: undetectable. If adherence drops below 95%, resistance wins — and you lose drug options permanently.
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