iofetamine (123i) iofetamine (123i) iofetamine (iodine-123, 123i), brand names perfusamine, spectamine), or n-isopropyl-(123i)-p-iodoamphetamine (imp), is a lipid-soluble amine and radiopharmaceutical drug used in cerebral blood perfusion imaging with single-photon emission computed tomography (spect). labeled with the radioactive isotope iodine-123, it is approved for use in the united states as a diagnostic aid in determining the localization of and in the evaluation of non-lacunar stroke and complex partial seizures, as well as in the early diagnosis of alzheimer's disease. iofetamine (123i)clinical dataatc codev09ab01 (who) legal statuslegal status in general: ℞ (prescription only) pharmacokinetic dataprotein binding<10%identifiers iupac name 1--n-isopropyl-2-propanamine cas number75917-92-9 85068-76-4 (non-labeled)95896-48-3 (123i-labeled hcl)pubchem cid156375chemspider137706uniilv23b78ijcchemblchembl1201308comptox dashboard (epa)dtxsid50997294 chemical and physical dataformulac12h18123inmolar mass299.278 g/mol3d model (jsmol)interactive image smiles cc(c)nc(c)cc1ccc(cc1)i inchi inchi=1s/c12h18in/c1-9(2)14-10(3)8-11-4-6-12(13)7-5-11/h4-7,9-10,14h,8h2,1-3h3/i13-4key:isehjshtivkela-dcwjvspssa-n an analogue of amphetamine, iofetamine has shown to inhibit the reuptake of serotonin and norepinephrine as well as induce the release of these neurotransmitters and of dopamine with similar potencies to other amphetamines like d-amphetamine and p-chloroamphetamine. in addition, on account of its high lipophilicity, iofetamine rapidly penetrates the blood-brain-barrier. accordingly, though not known to have been reported in the medical literature, iofetamine likely possesses psychostimulant and possibly entactogenic effects. however, based on structure-activity relationships, it may also be highly neurotoxic to serotonergic and dopaminergic neurons similarly to most other para-halogenated amphetamines.