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Acyclovir (Zovirax) versus ...

Acyclovir vs Erythromycin

Pityriasis Rosea

Acyclovir is more effective than erythromycin in reducing the severity and duration of pityriasis rosea.

The study 1 compared the effectiveness of oral erythromycin and oral acyclovir in the treatment of Pityriasis rosea. 42 patients with clinical diagnosis of Pityriasis rosea were enrolled and randomized into two groups. One group was given high-dose oral Acyclovir and another group oral Erythromycin in standard dose. After 8th week, all patients showed complete response in both the groups. The response to oral Acyclovir compared with that to oral Erythromycin was better and was statistically significant in 1st, 2nd, 4th and 6th weeks.

Acyclovir vs. Brivudin

Brivudin (bromovinyl deoxyuridine) is a nucleoside analogue with a high and selective antiviral activity against varicella-zoster virus (VZV) and herpes simplex virus type 1 (HSV-1). Brivudin has a markedly higher anti-VZV potency than oral acyclovir. Brivudin has no nephrotoxic properties, which is an advantage when compared to acyclovir.

Herpes Zoster
Brivudin significantly more effective than acyclovir in terminating vesicle formation in herpes zoster3. Both treatments are equally effective in the time to full crusting of lesions and time to loss of crusts.

In a double-blind survey study2 the incidence of zoster-associated pain occurring or persisting after rash healing was significantly lower in brivudin recipients (32.7%) than in acyclovir recipients (43.5%). Mean duration of postherpetic neuralgia was similar with brivudin (173 days) and acyclovir (164 days).

Acyclovir vs. Famciclovir (Famvir)

Famciclovir is more bioavailable than acyclovir (77% versus 30%) and has a longer intracellular half-life which allows for a twice daily dosing. So famciclovir is more convenient because it requires less frequent dosing.

However, cost considerations may override famciclovir's convenience when choosing between two medications that have comparable efficacy.

Herpes zoster
Acyclovir and famciclovir have comparable efficacy and similar safety profile.
In the clinical study there was no significant differences between the four treatment regiments (famciclovir 750 mg once daily, 500 mg twice daily and 250 mg daily, and aciclovir 800 mg five times daily) with respect to times to full crusting; loss of vesicles, ulcers and crusts; cessation of new lesion formation; a 50% reduction in the area of affected skin; and the loss of acute pain. 6
The pharmacokinetics of famciclovir allow a more convenient dosing schedule than the schedule used with acyclovir.

Acyclovir vs. Penciclovir (Denavir)

Penciclovir has a mechanism of action similar to that of acyclovir. Penciclovir triphosphate acts as a competitive inhibitor of viral DNA polymerase, but unlike acyclovir, it does not cause chain termination.

Herpes labialis (cold sores)
In comparative model the efficacy of penciclovir cream was greater than acyclovir cream. 5

Genital herpes
The results of the study showed that there is no significant differences in clinical efficacy between penciclovir 1% cream and acyclovir 3% cream with respect to clinical cure rate, times to healing, resolution of all symptoms, absence of blisters, cessation of new blisters, crusting, and loss of crust. However a significantly shorter time to crusting was found with penciclovir when compared with acyclovir. Adverse experience was was comparable with two medications. 4

Further reading

References
  • 1. Amatya A, Rajouria EA, Karn DK. Comparative study of effectiveness of oral acyclovir with oral erythromycin in the treatment of Pityriasis rosea. Kathmandu Univ Med J (KUMJ). 2012 PubMed
  • 2. Wassilew SW, Wutzler P; Brivddin Herpes Zoster Study Group. Oral brivudin in comparison with acyclovir for herpes zoster: a survey study on postherpetic neuralgia. Antiviral Res. 2003 Jun;59(1):57-60.
  • 3. Wassilew SW, Wutzler P; Brivddin Herpes Zoster Study Group. Oral brivudin in comparison with acyclovir for improved therapy of herpes zoster in immunocompetent patients: results of a randomized, double-blind, multicentered study. Antiviral Res. 2003 Jun;59(1):49-56.
  • 4. Chen XS, Han GZ, Guo ZP, Lu NZ, Chen J, Wang JB; Penciclovir Multicenter Genital Herpes Clinical Study Group. A comparison of topical application of penciclovir 1% cream with acyclovir 3% cream for treatment of genital herpes: a randomized, double-blind, multicentre trial. Int J STD AIDS. 2000 Sep;11(9):568-73. PubMed
  • 5. McKeough MB, Spruance SL. Comparison of new topical treatments for herpes labialis: efficacy of penciclovir cream, acyclovir cream, and n-docosanol cream against experimental cutaneous herpes simplex virus type 1 infection. Arch Dermatol. 2001 Sep;137(9):1153-8. PubMed
  • 6. Shafran SD, Tyring SK, Ashton R, Decroix J, Forszpaniak C, Wade A, Paulet C, Candaele D. Once, twice, or three times daily famciclovir compared with aciclovir for the oral treatment of herpes zoster in immunocompetent adults: a randomized, multicenter, double-blind clinical trial. J Clin Virol. 2004 Apr;29(4):248-53.

Published: March 31, 2008
Last updated: November 05, 2013

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