Right now, antiviral drugs, including acyclovir, famcyclovir, and valacyclovir are available to fight the disease. More than half of adults, in the US, are purported to be positive for antibodies.
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Wrist bands may be one option:
Homeopathy is certainly another:
Peppermint tea made from the water of boiled fresh ginger to be sipped before and during the ride is also another option.
Good luck in your quest.
My folks smoked in the car and that made me nauseous. I assume you don't do that.