chemistry

Pritelivir

Pritelivir is a chemistry topic covered in the lgStudy science library. This page brings together a partial reference excerpt, illustrations, worked examples, real-world applications and a short study plan, so you can understand Pritelivir rather than just read about it. In short: Pritelivir (development codes AIC316 or BAY 57-1293) is a direct-acting antiviral drug in development for the treatment of herpes simplex virus infections (HSV). This is particularly important in immune compromised patients.

Key takeaways

Pritelivir belongs to chemistry; place it in that map before memorising details.
Learn the definition first, then one example that makes the definition concrete.
Connect Pritelivir to a quantity you can measure, compute or draw — that is where exam questions come from.
Reproduce the core statement of Pritelivir from memory before moving on to harder problems.

Reference excerpt

Pritelivir (development codes AIC316 or BAY 57-1293) is a direct-acting antiviral drug in development for the treatment of herpes simplex virus infections (HSV). This is particularly important in immune compromised patients. It is currently in Phase III clinical development by the German biopharmaceutical company AiCuris Anti-infective Cures AG. US FDA granted fast track designation for pritelivir in 2017 and breakthrough therapy designation 2020. In April 2026, the FDA granted priority review to the new drug application for pritelivir with target date for a final decision in late 2026.

Medical use Pritelivir is currently being developed for the treatment of immunocompromised patients with mucocutaneous HSV lesions that are resistant to acyclovir.

HSV in immunocompromised patients Although HSV infection is very common in the general population, it rarely causes serious disease and is effectively contained by the immune system. In those with a weakened immune system such as transplant recipients, people receiving chemo- or radiotherapy, or HIV patients, an active HSV infection can cause disease in 35-68% of patients and may become severe or even life-threatening.

Standard of care treatments HSV treatment revolves around the use of nucleoside analogues (NA) which act via the viral DNA polymerase, causing DNA chain termination and prevention of viral replication. First-line treatment is generally acyclovir or its prodrug valacyclovir. Resistance to acyclovir is more common in HSV patients with weakened or suppressed immune systems, affecting between 4 and 25% of cases.

Resistance to standard treatments If HSV drug resistance is mediated by mutation(s) of the viral UL23 gene, which encodes the viral thymidine kinase (TK), then the pyrophosphate analogue foscarnet may be effective as a rescue treatment, since it does not require activation by TK. The use of foscarnet is commonly accompanied by restrictive toxicity, particularly nephrotoxicity. If the virus also acquires resistance to foscarnet, then there is currently no FDA approved treatment.

Clinical research

Completed phase II clinical trials in otherwise healthy patients with genital herpes A Double-blind Randomized Placebo Controlled Dose-finding Trial to Investigate Different Doses of a New Antiviral Drug in Subjects With Genital HSV Type 2 Infection. A Double-blind, Double Dummy, Randomized Crossover Trial to Compare the Effect of "AIC316 (Pritelivir)" 100 mg Once Daily Versus Valacyclovir 500 mg Once Daily on Genital HSV Shedding in HSV-2 Seropositive Adults.

Ongoing phase II / phase III clinical trials with pritelivir A phase II / III multinational, comparator-controlled, clinical trial in immunocompromised patients with acyclovir-resistant mucocutaneous lesions is listed on ClinicalTrials.gov and EudraCT.

Pharmacology

Mechanism of action Pritelivir is a member of the helicase-primase inhibitors (HPI), a novel class of direct-acting antiviral drugs acting specifically against HSV-1 and HSV-2. As the name suggests, the drugs act through inhibition of the viral helicase primase complex, encoded by the UL5 (helicase), UL8 (scaffold protein) and UL52 (primase) genes, which is essential for HSV replication. The helicase primase complex is encoded separately from the viral DNA polymerase (encoded by the UL30 gene). Because HPIs i) do not target the viral DNA polymerase and ii) do not require activation by the viral thymidine kinase enzyme (encoded by the UL23 gene), mutations causing resistance to NAs are not protective against HPIs. Similarly, resistance to HPIs does not confer resistance to NAs.

Illustrations

Worked examples

Example 1 — a first encounter with Pritelivir

Start with the simplest possible case. Write down what Pritelivir claims or describes in one sentence, then invent the smallest concrete situation in which that sentence is true. In chemistry, the smallest case is usually a single object, a single equation or a single measurement. Check that every symbol or term in your sentence has a meaning in that case.

Example 2 — changing one variable

Take the situation from Example 1 and change exactly one quantity: double it, halve it, or set it to zero. Predict what should happen to Pritelivir before you calculate. Comparing your prediction with the result is the fastest way to find out whether you understand the idea or only the words.

Example 3 — an exam-style question

Typical questions about Pritelivir ask you to (a) state it precisely, (b) apply it to given data, and (c) explain a limitation. Practise writing all three answers in under five minutes; the third part is what separates a full-mark answer from an average one.

Applications of Pritelivir

In research: Pritelivir appears in chemistry research whenever the underlying quantities have to be modelled precisely. Papers usually cite it as a starting assumption and then explore where it breaks down.
In technology and industry: Engineering practice reuses Pritelivir in design rules, simulations and safety margins. Knowing the idea lets you read a specification sheet and understand why the numbers look the way they do.
In the classroom: Pritelivir is common in secondary-school and first-year university syllabi. It links to neighbouring topics 2-Pyridyl compounds, Acetamides, Antiviral drugs, so understanding it makes those chapters shorter.
In everyday life: Look for Pritelivir outside the textbook — in sport, cooking, traffic, electronics or the sky above you. An example you found yourself is remembered far longer than one you were given.

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How to study Pritelivir in 20 minutes

Read the reference excerpt below once, without taking notes.
Close the page and write down what Pritelivir means in your own words.
Compare your version with the excerpt and mark what you missed.
Work through the three examples above with pen and paper.
Explain Pritelivir out loud to somebody else — or to Teacher Smith in the lgStudy chat.

Frequently asked questions

What is Pritelivir in simple terms?

Why does Pritelivir matter?

Because it connects several chemistry ideas at once: it gives you a definition you can apply, a quantity you can calculate, and a way to check whether a result is plausible.

How should I study Pritelivir?

Read the excerpt, restate it from memory, then work through the examples and applications listed on this page. The five-step study plan above takes about twenty minutes.

What does this page cover?

It gives you a compact reference excerpt plus original lgStudy explanations, examples, applications and study material on Pritelivir.