Acyclovir interactions

Acyclovir (Zovirax), an antiviral has 15 documented interactions across the FDA labels and fact sheets we index: 4 major, 8 moderate, 2 minor, and 1 where a label reports no significant interaction. Each entry below quotes the sentence behind it. This drug page is a starting point, not a verdict for your situation.

What Acyclovir looks like

All 21 versions
Acyclovir 400 mg tablet: white, round, 12 mm, imprinted Y212.
Y212
400 mg · white · round · 12 mm
Westminster
Acyclovir 200 mg capsule: blue and white, 19 mm, imprinted 668.
668
200 mg · blue and white · capsule · 19 mm
Zydus Lifesciences
Acyclovir 200 mg capsule: blue, 19 mm, imprinted CP115 on one side and 200 on the other.
CP115 / 200
200 mg · blue · capsule · 19 mm
Modavar
Acyclovir 200 mg capsule: white and blue, 19 mm, imprinted Y211.
Y211
200 mg · white and blue · capsule · 19 mm
Avet

Renderings from the FDA labels' product listings: color, shape, size, and imprint. 21 documented versions from 14 labelers.

Interactions from the label

Major interactions (4)

  • FoscarnetantiviralMajor

    FOSCAVIR IS INDICATED FOR USE ONLY IN IMMUNOCOMPROMISED PATIENTS WITH CMV RETINITIS AND MUCOCUTANEOUS ACYCLOVIR-RESISTANT HSV INFECTIONS. (Foscarnet label, Boxed warning)

  • MeperidineopioidMajor

    Intervention: If concomitant use of acyclovir and DEMEROL Injection is necessary, monitor patients for respiratory depression and sedation at frequent intervals. (Meperidine label, Drug interactions)

  • Tizanidinemuscle relaxantMajor

    Moderate or Weak CYP1A2 Inhibitors Concomitant use of Zanaflex with moderate or weak CYP1A2 inhibitors (e.g., zileuton, antiarrhythmics [amiodarone, mexiletine, propafenone, and verapamil], cimetidine, famotidine, oral contraceptives, acyclovir, and ticlopidine) should be avoided. (Tizanidine label, Drug interactions)

  • ValacyclovirantiviralMajor

    CONTRAINDICATIONS Acyclovir tablets are contraindicated in patients who have demonstrated clinically significant hypersensitivity reaction [e.g., anaphylaxis, severe cutaneous adverse reactions (SCARs) to acyclovir, valacyclovir, or any component of the formulation (see WARNINGS and ADVERSE REACTIONS ). (Acyclovir label, Contraindications)

Moderate interactions (8)

  • Some examples include, but are not limited to, acyclovir, cidofovir, ganciclovir, valacyclovir, valganciclovir, aminoglycosides (e.g., gentamicin), and high-dose or multiple NSAIDs [see Warnings and Precautions (5.4) ] . (Efavirenz, lamivudine, and tenofovir label, Drug interactions)

  • Some examples of drugs that are eliminated by active tubular secretion include, but are not limited to, acyclovir, cidofovir, ganciclovir, valacyclovir, valganciclovir, aminoglycosides (e.g., gentamicin), and high-dose or multiple NSAIDs [see Warnings and Precautions (5.4) ] . (Elvitegravir, cobicistat, emtricitabine, and tenofovir label, Drug interactions)

  • Emtricitabine and tenofovirantiretroviralModerate

    Some examples of drugs that are eliminated by active tubular secretion include, but are not limited to, acyclovir, cidofovir, ganciclovir, valacyclovir, valganciclovir, aminoglycosides (e.g., gentamicin), and high-dose or multiple NSAIDs [see Warnings and Precautions (5.4) ] . (Emtricitabine and tenofovir label, Drug interactions)

  • Some examples of drugs that are eliminated by active tubular secretion include, but are not limited to, acyclovir, adefovir dipivoxil, cidofovir, ganciclovir, valacyclovir, valganciclovir, aminoglycosides (e.g., gentamicin), and high-dose or multiple NSAIDs [see Warnings and Precautions (5.5) ] . (Emtricitabine, rilpivirine, and tenofovir label, Drug interactions)

  • ProbenecidModerate

    Drug Interactions Coadministration of probenecid with intravenous acyclovir has been shown to increase the mean acyclovir half-life and the area under the concentration-time curve. (Acyclovir label, Drug interactions)

  • Drug Interactions Coadministration of probenecid with intravenous acyclovir has been shown to increase the mean acyclovir half-life and the area under the concentration-time curve. (Acyclovir label, Drug interactions)

  • TenofovirantiretroviralModerate

    Some examples include, but are not limited to, acyclovir, cidofovir, ganciclovir, valacyclovir, valganciclovir, aminoglycosides (e.g., gentamicin), and high-dose or multiple NSAIDs [see Warnings and Precautions (5.2) ]. (Tenofovir label, Drug interactions)

  • WarfarinanticoagulantModerate

    …fluvastatin, fluvoxamine, metronidazole, miconazole, oxandrolone, sulfinpyrazone, tigecycline, voriconazole, zafirlukast aprepitant, bosentan, carbamazepine, phenobarbital, rifampin CYP1A2 acyclovir, allopurinol, caffeine, cimetidine, ciprofloxacin, disulfiram, enoxacin, famotidine, fluvoxamine, methoxsalen, mexiletine, norfloxacin, oral contraceptives, phenylpropanolamine,… (Warfarin label, Drug interactions)

Minor mentions (2)

  • AbataceptimmunosuppressantMinor

    Three of the 4 patients discontinued acyclovir prophylaxis at day 30 post-transplant. (Abatacept label, Warnings and precautions)

  • CidofovirantiviralMinor

    Drug Interactions Probenecid Probenecid is known to interact with the metabolism or renal tubular excretion of many drugs (e.g., acetaminophen, acyclovir, angiotensin-converting enzyme inhibitors, aminosalicylic acid, barbiturates, benzodiazepines, bumetanide, clofibrate, methotrexate, famotidine, furosemide, nonsteroidal anti-inflammatory agents, theophylline,… (Cidofovir label, Drug interactions)

No significant interaction reported (1)

  • MycophenolateimmunosuppressantNo interaction

    Examples Acyclovir, ganciclovir, probenecid, valacyclovir, valganciclovir Combination Oral Contraceptives Clinical Impact Concomitant use with mycophenolate mofetil decreased the systemic exposure to levonorgestrel, but did not affect the systemic exposure to ethinylestradiol [see Clinical Pharmacology ( 12.3 )], which may result in reduced combination oral contraceptive… (Mycophenolate label, Drug interactions)

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Not medical advice. Severity reflects the label's wording, not your circumstances. A "major" flag can be routine under supervision and a "minor" one can matter at high doses. Ask a pharmacist.