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“On the other hand, lipophilic cationic drugs, such as clonidine, bisoprolol, diphenhydramine , pyrilamine, and imipramine, significantly decreased the uptake of quinidine in MDCK cells.”
European Journal of Drug Metabolism and Pharmacokinetics • 2015 | View Paper
“The diphenhydramine uptake was significantly inhibited by amantadine and quinidine , but not tetraethylammonium and 1-methyl-4-phenylpyridinium (substrates for well-known organic cation transporters).”