Acyclovir for Uveitis
For HSV or VZV uveitis in adults, treat with oral acyclovir 800 mg five times daily for 7 days, or alternatively valacyclovir 1000 mg every 8 hours for 7 days, with dose adjustment required for renal impairment.
Treatment Regimen
HSV Uveitis
For HSV-associated anterior uveitis, the standard oral antiviral options are 1:
- Acyclovir: 200-400 mg five times daily
- Valacyclovir: 500 mg two to three times daily
- Famciclovir: 250 mg twice daily
However, most experts prefer valacyclovir due to simpler dosing schedules 2.
VZV Uveitis (Including Herpes Zoster Ophthalmicus)
For VZV-associated uveitis or ocular complications, higher doses are required because VZV is less sensitive to acyclovir than HSV 3, 4:
- Acyclovir: 800 mg five times daily for 7 days 1
- Valacyclovir: 1000 mg every 8 hours for 7 days 1
- Famciclovir: 500 mg three times daily for 7 days 1
Treatment must be initiated within 72 hours of symptom onset for maximum efficacy, ideally within 48 hours 5.
Renal Dose Adjustment
Critical caveat: Acyclovir is eliminated primarily by the kidneys through glomerular filtration and tubular secretion 5, 6. Dose reduction is mandatory in patients with impaired renal function 5, 7.
- Maintain adequate hydration during treatment 5
- Monitor for reversible renal dysfunction and CNS symptoms 5
- Avoid concurrent nephrotoxic agents 5
- Elderly patients require particular attention as they have higher plasma concentrations due to age-related renal decline 5
Adjunctive Management
Topical Corticosteroids
- Use judiciously for controlling intraocular inflammation
- Avoid in HSV epithelial disease as corticosteroids potentiate HSV epithelial infections 1
- Taper to minimum effective dose once inflammation is controlled 1
- Monitor intraocular pressure (IOP) regularly during use 1
Glaucoma Management
- VZV uveitis commonly causes trabeculitis-induced glaucoma 4
- Use topical beta-blockers if IOP elevation occurs 2
- Resolution of inflammation and normalization of IOP are treatment endpoints 2
Chronic or Recurrent Disease
For patients with chronic disease or frequent recurrences:
- Prolonged treatment may be required with dose adjustment based on clinical response 1
- Long-term prophylaxis with lower doses of oral antivirals should be considered 1
- Immunocompromised patients need more aggressive treatment 1
Important Clinical Pearls
Diagnostic features highly specific for HSV/VZV uveitis 2:
- Unilaterality
- Elevated IOP
- Decreased corneal sensation
- Diffuse or sectoral iris atrophy (sectoral atrophy particularly characteristic of HSV)
Complications to monitor 4:
- Iris atrophy
- Complicated cataract
- Neurotrophic keratopathy
- Optic nerve involvement
- In severe cases: acute retinal necrosis (immunocompetent) or progressive outer retinal necrosis (immunosuppressed)
Follow-up: Patients should be re-evaluated within 1 week, including visual acuity measurement, IOP check, and slit-lamp biomicroscopy 1.