hot pink, caplet shaped. Not marked "Sankyo"
Pill imprint C22 has been identified as Diphenhydramine Hydrochloride 25 mg, a generic version of Benadryl available over-the-counter for the treatment of allergies. It is a pink, oval tablet.
You will find more info here https://www.drugs.com/otc/112204/north-antihistamine.html
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