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Medicines > classes: [[:Category:Anti-herpesvirus_agents|Anti-herpesvirus agent]] & onset: Symptom relief within 24-48 hours

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generic:
Valacyclovir (1)
brand:
Valtrex (1)
classes: (Click arrow to add another value)
mechanism:
'"`UNIQ--vote-000005D0-QINU`"' Selectivity comes from the viral-kinase-only initial phosphorylation step, which is why uninfected cells generate minimal active drug'"`UNIQ--ref-000005D1-QINU`"'. Dose-adjust by renal function; rare crystalline nephropathy with rapid IV acyclovir. (1)
uses:
'"`UNIQ--vote-000005D2-QINU`"', '"`UNIQ--vote-000005D3-QINU`"', '"`UNIQ--vote-000005D4-QINU`"', '"`UNIQ--vote-000005D5-QINU`"' (1)
starting dose:
Initial genital herpes 1 g PO BID × 10 days; recurrent 500 mg BID × 3 days; suppression 500 mg-1 g PO daily; zoster 1 g TID × 7 days (1)
preparations:
500 mg, 1 g tablets (1)
fda max:
3 g/d (zoster) (1)
routes:
Oral (1)
onset: (Click arrow to add another value)
duration:
8 hours per dose (1)
halflife:
~3 hours (acyclovir, the active metabolite); longer in renal impairment'"`UNIQ--ref-000005D6-QINU`"' (1)
bioavailability:
~55% bioavailability of acyclovir after valacyclovir oral (vs ~20% from oral acyclovir directly)'"`UNIQ--ref-000005D7-QINU`"' (1)
pregnancy:
Widely used in pregnancy when antiviral indicated; reassuring registry data.<sup class="pcp-cn" title="This claim needs a citation.">&#91;[[Pharmacopedia:Citation needed|citation&nbsp;needed]]&#93;</sup> (1)
legal:
[[USLegal:Prescription only|Rx-only]] in US (1)

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