Unfortunately you do not mention a color or shape?
There is one pill that might match your description of R I imprint..
Pill imprint R 1 has been identified as Rymed (dexchlorpheniramine maleate 2 mg/phenylephrine hydrochloride 10 mg). It is an OTC medication for the treatment of cold symptoms.
There is an image in the link above. If this is not your pill, please let us know and we will keep searching.
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