Acyclovir: If you get aphthous ulcers (cold or canker sores) frequently then the prescription medicine Acyclovir could help. But you usually have to get it going before you see a sore....Like at the first inkling.
Answered 6/24/2014
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No cure: Treatment of cold sores are with antivirals. Aphthous ulcers take time. L-lysine can treat these and taken regularly can help prent recurrences. Stress is usual cause - emotional, environmental and chemical (citrus, acidic etc). Stresss reduction, exercise and healthy, bland diet, and laughter can help speed healing. If persistent or recurretnt see your primary physician for further eval.
Answered 12/11/2019
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