Speed matters most with cold sores. Antivirals shorten outbreaks by 1 to 2 days when started within the first 24 hours. Walk in, get assessed in 15 minutes, leave with the prescription and a plan for next time.
What a cold sore actually is
Cold sores are caused by herpes simplex virus type 1 (HSV-1). More than half of adults carry it, most having picked it up in childhood through casual contact (a kiss, a shared drink, a borrowed lip balm). The virus stays dormant in nerve tissue near the mouth until something triggers it.
Common triggers: physical or emotional stress, sleep loss, recent illness, hormonal shifts, sun exposure, minor lip injuries. When activated, you feel a tingle, then fluid-filled blisters appear within 1 to 2 days. They rupture, crust over, and resolve in 7 to 10 days without treatment. Prescription antivirals can meaningfully shorten that timeline if you start them early.
Treatment options
Docosanol (Abreva)
Over-the-counter, around $20. Modest healing reduction with frequent early application. Less effective than prescription alternatives.
Oral valacyclovir
The most commonly prescribed antiviral. Two-dose regimen taken 12 hours apart. Reduces outbreak duration by 1 to 2 days when started within 24 hours of symptoms.
Oral acyclovir
Older, effective antiviral that needs more frequent dosing over several days.
Oral famciclovir
Effective alternative, sometimes the better fit for certain medical situations.
Topical penciclovir (Denavir)
Prescription cream applied every two hours while awake. Less effective than oral options and more demanding to use consistently.
Timing is everything. Starting during the prodrome (the tingle, before visible blisters) gets the best result.
Why a pharmacist visit makes sense
No appointment, no referral, no wait. In Alberta, pharmacist assessments for minor ailments including cold sores are fully covered by Alberta Health Care.
For frequent sufferers we set up a standing prescription so the medication is available the moment you feel a tingle, no second visit required.
What the visit looks like
About 10 minutes in our consultation room. Symptom onset, outbreak frequency, what you've used before, medical history, current medications. No physical exam, just clinical conversation. If antivirals are appropriate, we dispense immediately. Most patients in and out under 15 minutes.
Prevention
For 4 to 5 or more outbreaks a year, daily suppressive therapy (typically low-dose valacyclovir) reduces frequency and transmission risk without eliminating the virus.
An underrated prevention strategy: SPF lip balm applied consistently before sun exposure. Sun reliably triggers HSV-1, and an SPF 30+ balm under $10 measurably reduces outbreaks in susceptible individuals.
Transmission
HSV-1 is highly transmissible during active outbreaks. The virus is in the blister fluid and surrounding skin even before the sore is fully visible. Active outbreaks: avoid kissing, sharing utensils, and close facial contact, particularly with young children. After complete healing (no remaining crust or open skin) transmission risk drops substantially.
Cold sores in children
Children typically pick up HSV-1 through affectionate contact with infected adults. The first outbreak can be more severe than later ones (more widespread blistering, sometimes flu-like symptoms) because their immune system has never met the virus before. Antivirals reduce severity in both first and recurrent outbreaks. Our pharmacist can assess and recommend next steps.
Walk in
(780) 443-0202. Unit 103, 15508 87 Ave NW, Meadowlark Place, Edmonton. The earlier you come in, the better the medication works.