Be careful with such "feelings". Yes, the primary amine, amphetamine, has serotonergic activity, just not as much as the secondary amine, methamphetamine.
I've copied some data over from
Reddit on monoamine releasing agents so you can compare.
NOTE: Please keep in mind lower values correspond to higher binding affinities + more release or more reuptake inhibition. In other words, less is more. You can see right away that amphetamine is a bigger releaser of norepinephrine (read: adrenaline) than either isomer of methamphetamine and it also causes greater reuptake of this neurotransmitter as well. I know this because its IC50 (nM) value is 7.07 for NE release while its NE reuptake inhibition, measured as a Ki (nM) value, is 38.9. These values are lower than those listed in rows 2 and 3 of Table 1 corresponding to methamphetamines isomers. I hope this makes sense.
Also: NE = norepinephrine | 5-HT = serotonin | DA = dopamine
Table 1
Drug | NE Release | NE Uptake | 5-HT Release | 5-HT Uptake | DA Release | DA Uptake |
---|
(+)-Amphetamine | 7.07 | 38.9 | 1,765 | 3,830 | 24.8 | 34 |
(-)-Methamphetamine | 28.5 | 234 | 4,640 | 14,000 | 416 | 4,840 |
(+)-Methamphetamine | 12.3 | 48.0 | 736 | 2,137 | 24.5 | 114 |
(-)-Ephedrine | 72.4 | 225 | >10,000 | >50,000 | 1,350 | 4,398 |
(+/-)-MDMA | 77.4 | 462 | 56.6 | 238 | 376 | 1,572 |
Cocaine | >10,000 | 779 | >10,000 | 304 | >10,000 | 478 |
RTI-55 | >10,000 | 5.89 | >10,000 | 1 | >10,000 | 0.83 |
RTI-229 | >10,000 | 19.5 | >10,000 | 362 | >10,000 | 2.15 |
Source:
Amphetamine-Type Central Nervous System Stimulants Release Norepinephrine More Potently Than They Release Dopamine and Serotonin, Rothman et. al.
Measurement: IC50 (nM) for release / Ki (nM) for uptake
Table 2
Drug | NE Release | DA Release | 5-HT Release |
---|
4-FA | 28 | 51.5 | 939 |
4-MA | 22.2 | 44.1 | 53.4 |
(d)-Amphetamine | 7.1 | 110.3 | 1,765 |
Benzylpiperazine | 62 | 175 | 6,050 |
Cathine | 15.0 | 68.3 | - |
(l)-Cathinone | 1,206.2 | 18.5 | 2,366 |
(l)-ephedrine | 43.1 | 236 | >10,000 |
(d)-ephedrine | 218 | 2,104 | >10,000 |
(d)-Methamphetamine | 489 | 24.5 | 736 |
(l)-Methamphetamine | 234 | 4,480 | >10,000 |
(l)-Methcathinone | 707 | 14.8 | 1772 |
MDA | 108 | 190 | 160 |
MDMA | 110 | 278 | 72 |
Phenmetrazine | 50.4 | 131 | 7,765 |
Psuedoephedrine | 3112 | 1988 | >10,000 |
Source:
Releasing Agents - Release Affinities of Selected Compounds, References 4-9
Measurement: Ki (nM) for release
Table 3
Drug | NE Uptake | DA Uptake | NET Binding | DAT Binding |
---|
(d)-methylphenidate | 46 | 28 | 408 | 139 |
(d/l)-methylphenidate | 31 | 24 | 1,560 | 105 |
(d)-ethylphenidate | 247 | 24 | 2,479 | 276 |
(d/l)-ethylphenidate | 408 | 82 | 4,824 | 382 |
Source:
Ethylphenidate - Pharmacodynamics, References 7-9
Measurement: Ki (nM) for transporter binding, IC50 for uptake
EDIT: Getting to my point finally, d-amphetamine's IC50 (nM) value for 5-HT release is 1,765 whereas d-methamphetamine's value is 736, quite a good bit lower.