| Nomenclature | Organic cation transporter 1 | Organic cation transporter 2 | Organic cation transporter 3 |
| Systematic nomenclature | SLC22A1 | SLC22A2 | SLC22A3 |
| Common abbreviation | OCT1 | OCT2 | OCT3 |
| HGNC, UniProt | SLC22A1, O15245 | SLC22A2, O15244 | SLC22A3, O75751 |
| Endogenous substrates | 5-HT, PGE2, PGF2α, choline | dopamine 303, histamine 303, PGE2 304 | 5-HT 307, (-)-noradrenaline 307, dopamine 307 |
| Substrates | tetraethylammonium, desipramine, MPP+, metformin, acyclovir | (+)-tubocurarine 302, tetraethylammonium 302, pancuronium 302, MPP+ 302 | quinidine, tetraethylammonium, MPP+ |
| Stoichiometry | Unknown | Unknown | Unknown |
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