---
title: "Integrase Inhibitors | Microbiology"
description: "Integrase inhibitors are antiretroviral drugs that block HIV integrase, stopping viral DNA from joining host DNA in Microbiology."
canonical: "https://fiveable.me/microbio/key-terms/integrase-inhibitors"
type: "key-term"
subject: "Microbiology"
unit: "Unit 14"
---

# Integrase Inhibitors | Microbiology

## Definition

Integrase inhibitors are antiviral drugs that block the enzyme HIV uses to insert viral DNA into a host cell's genome. In Microbiology, they are studied as part of antiretroviral therapy for HIV.

## What It Is

Integrase inhibitors are a class of antiretroviral drugs in Microbiology that stop HIV from inserting its DNA into the host cell’s chromosome. They target the viral enzyme integrase, which HIV needs after reverse transcription but before long-term infection can continue.

Here is the basic sequence: HIV enters a host cell, reverse transcriptase converts the viral RNA into DNA, and then integrase tries to splice that viral DNA into the host genome. If integration happens, the cell can keep making new viral particles. If integrase is blocked, the viral DNA stays separate and cannot become part of the cell’s permanent genetic material.

That step matters because integration is what turns a temporary infection into a persistent one. Without it, HIV cannot efficiently hijack the host cell’s machinery for ongoing replication. This is why integrase inhibitors are such a strong part of modern HIV treatment, especially in combination regimens.

Common drugs in this class include raltegravir, elvitegravir, and dolutegravir. They are usually given as part of combination antiretroviral therapy, or ART, rather than alone. Using multiple drugs at once lowers the chance that the virus will mutate around one drug and keep replicating.

A useful way to think about them is as a “copy-paste blocker” for HIV DNA. Reverse transcriptase inhibitors stop the virus from making DNA in the first place, while integrase inhibitors stop that DNA from being inserted into the host genome. The timing is different, which is why these drug classes are often compared together in microbiology.

Resistance can develop if the virus acquires mutations in the integrase gene. When that happens, the drug may bind less well, so the virus can keep integrating even in the presence of treatment. That is one reason microbiology courses connect these drugs to mutation, selection, and combination therapy.

## Why It Matters

Integrase inhibitors show up whenever Microbiology connects viral structure to drug action. They give you a clear example of how a medication can target one very specific enzyme in a pathogen without stopping every cell process in the body.

This term also helps you compare antiretroviral drug classes. If you know where integrase fits in the HIV life cycle, you can separate it from reverse transcriptase inhibitors, which act earlier, and protease inhibitors, which act later when new viral proteins need to be cut into functional pieces.

That sequence matters in case-based questions and class discussions about HIV treatment. You may be asked why combination therapy works better than a single drug, why resistance develops, or why a treatment plan includes drugs that act at different stages of replication.

It also connects to the bigger microbiology idea that microbes evolve under drug pressure. A mutation in the integrase gene can reduce drug binding, so the virus population shifts toward resistant variants if the same drug is used by itself or if adherence is inconsistent.

## Connections

### [reverse transcriptase inhibitors](/microbio/key-terms/reverse-transcriptase-inhibitors)

These drugs block the enzyme HIV uses to turn its RNA into DNA. They work earlier than integrase inhibitors, so together the two classes interrupt two different steps in the same replication pathway. If a question asks you to trace the HIV life cycle, reverse transcriptase inhibitors stop the viral DNA from being made, while integrase inhibitors stop that DNA from being inserted into the host genome.

### [protease inhibitors](/microbio/key-terms/protease-inhibitors)

Protease inhibitors act later in HIV replication than integrase inhibitors. Instead of blocking DNA integration, they stop viral proteins from being cut into mature, functional pieces. That difference is useful when you are comparing drug classes by stage of action, especially in combination antiretroviral therapy.

### [antiretroviral therapy (ART)](/microbio/key-terms/antiretroviral-therapy-art)

Integrase inhibitors are one drug class used in ART, which combines multiple antiretroviral drugs to suppress HIV more effectively. ART matters because one drug usually is not enough to fully control replication and resistance can build quickly. If you see a treatment regimen in a microbiology problem, ART is the bigger framework that explains why these drugs are paired.

## On the AP Exam

A quiz question may give you the HIV life cycle and ask which step an integrase inhibitor blocks. You should identify the integration step, not entry, reverse transcription, or protease processing. In a short-answer or multiple-choice setting, the best move is to connect the drug to the viral enzyme integrase and explain that it prevents viral DNA from joining the host genome. If the prompt asks about resistance, mention mutations in the integrase gene and why combination therapy lowers that risk. In a case study, you might also compare this class with reverse transcriptase inhibitors or protease inhibitors by matching each one to a different stage of replication.

## integrase inhibitors vs reverse transcriptase inhibitors

These are often confused because both are used against HIV and both interrupt the viral replication cycle. The difference is the target and the timing: reverse transcriptase inhibitors block RNA to DNA conversion, while integrase inhibitors block the insertion of viral DNA into the host genome. If you can place each drug on the replication timeline, the distinction becomes easy.

## Key Takeaways

- Integrase inhibitors block the HIV enzyme integrase, which prevents viral DNA from integrating into the host genome.
- They work after reverse transcription but before the virus can establish a stable, long-term infection in the cell.
- Common examples include raltegravir, elvitegravir, and dolutegravir.
- These drugs are usually part of combination antiretroviral therapy because multiple drugs lower the chance of resistance.
- Mutations in the viral integrase gene can make the virus less sensitive to these drugs.

## FAQs

### What is integrase inhibitors in Microbiology?

Integrase inhibitors are antiretroviral drugs that stop HIV integrase from inserting viral DNA into the host cell genome. In Microbiology, they are studied as part of HIV treatment and viral replication control. Without integration, HIV cannot maintain the same level of persistent infection.

### How are integrase inhibitors different from reverse transcriptase inhibitors?

Reverse transcriptase inhibitors block the step where HIV converts RNA into DNA. Integrase inhibitors act later and block the insertion of that viral DNA into the host chromosome. Both stop replication, but they hit different enzymes at different points in the cycle.

### Why are integrase inhibitors used with other HIV drugs?

They are usually combined with other antiretroviral drugs to suppress the virus from more than one angle. That makes treatment more effective and lowers the chance that a resistant virus will survive. In microbiology terms, combination therapy slows the selection of mutant strains.

### Can HIV become resistant to integrase inhibitors?

Yes. Mutations in the viral integrase gene can reduce how well the drug binds, which lets the virus keep integrating DNA even during treatment. That is why microbiology classes connect these drugs to mutation, selection pressure, and combination therapy.

## Related Study Guides

- [14.4 Mechanisms of Other Antimicrobial Drugs](/microbio/unit-14/4-mechanisms-antimicrobial-drugs/study-guide/7T11XM2vS6zHCitw)

## About This Document

Canonical Fiveable pages are available as Markdown at the same path plus `.md`.

- [llms.txt](https://fiveable.me/llms.txt): index of Fiveable's sections and URL patterns
- [llms-full.txt](https://fiveable.me/llms-full.txt): complete subject and unit listing
- [MCP server](https://fiveable.me/mcp): call Fiveable as tools instead of fetching pages (`https://fiveable.me/api/mcp`)
- [MCP server for AP teachers](https://fiveable.me/mcp/teachers): a teacher's classes, assignments and AP-rubric grading (`https://fiveable.me/api/mcp/teacher`)

## Structured Data

```json
{"@context":"https://schema.org","@graph":[{"@type":"LearningResource","@id":"https://fiveable.me/microbio/key-terms/integrase-inhibitors#resource","name":"Integrase Inhibitors | Microbiology","url":"https://fiveable.me/microbio/key-terms/integrase-inhibitors","learningResourceType":"Concept explainer","educationalLevel":"AP® / High School","about":{"@id":"https://fiveable.me/microbio/key-terms/integrase-inhibitors#term"},"audience":{"@type":"EducationalAudience","educationalRole":"student"},"dateModified":"2026-07-03T02:23:50.401Z","isPartOf":{"@type":"Collection","name":"Microbiology Key Terms","url":"https://fiveable.me/microbio/key-terms"},"publisher":{"@type":"Organization","name":"Fiveable","url":"https://fiveable.me"}},{"@type":"DefinedTerm","@id":"https://fiveable.me/microbio/key-terms/integrase-inhibitors#term","name":"integrase inhibitors","description":"Integrase inhibitors are antiviral drugs that block the enzyme HIV uses to insert viral DNA into a host cell's genome. In Microbiology, they are studied as part of antiretroviral therapy for HIV.","url":"https://fiveable.me/microbio/key-terms/integrase-inhibitors","inDefinedTermSet":{"@type":"DefinedTermSet","name":"Microbiology Key Terms","url":"https://fiveable.me/microbio/key-terms"}},{"@type":"FAQPage","mainEntity":[{"@type":"Question","name":"What is integrase inhibitors in Microbiology?","acceptedAnswer":{"@type":"Answer","text":"Integrase inhibitors are antiretroviral drugs that stop HIV integrase from inserting viral DNA into the host cell genome. In Microbiology, they are studied as part of HIV treatment and viral replication control. Without integration, HIV cannot maintain the same level of persistent infection."}},{"@type":"Question","name":"How are integrase inhibitors different from reverse transcriptase inhibitors?","acceptedAnswer":{"@type":"Answer","text":"Reverse transcriptase inhibitors block the step where HIV converts RNA into DNA. Integrase inhibitors act later and block the insertion of that viral DNA into the host chromosome. Both stop replication, but they hit different enzymes at different points in the cycle."}},{"@type":"Question","name":"Why are integrase inhibitors used with other HIV drugs?","acceptedAnswer":{"@type":"Answer","text":"They are usually combined with other antiretroviral drugs to suppress the virus from more than one angle. That makes treatment more effective and lowers the chance that a resistant virus will survive. In microbiology terms, combination therapy slows the selection of mutant strains."}},{"@type":"Question","name":"Can HIV become resistant to integrase inhibitors?","acceptedAnswer":{"@type":"Answer","text":"Yes. Mutations in the viral integrase gene can reduce how well the drug binds, which lets the virus keep integrating DNA even during treatment. That is why microbiology classes connect these drugs to mutation, selection pressure, and combination therapy."}}]},{"@type":"BreadcrumbList","itemListElement":[{"@type":"ListItem","position":1,"name":"Microbiology","item":"https://fiveable.me/microbio"},{"@type":"ListItem","position":2,"name":"Key Terms","item":"https://fiveable.me/microbio/key-terms"},{"@type":"ListItem","position":3,"name":"Unit 14","item":"https://fiveable.me/microbio/unit-14"},{"@type":"ListItem","position":4,"name":"integrase inhibitors"}]}]}
```