| Term | Definition |
| Hemicholinium | inhibits transport of choline into nerve terminal |
| Vesamicol | inhibits transport of choline into vesicles |
| Botulinum | inhibits release of vesicles containing ACh by altering synaptobrevin, other docking/fusion proteins |
| AChE inhibitors | inhibit the enzyme which terminates the action of ACh in the synapse |
| Metyrosine | inhibits tyrosine hydroxylase, which converts tyrosine to DOPA |
| MAO inhibitors | inhibit the enzymes which inactivate D and NE in the cytoplasm |
| Reserpine | inhibits the vesicular transport of D and NE |
| Cocaine | Inhibits uptake of NE, increasing transmitter effect on post-synaptic receptors |
| Guanethidine | inhibits release of vesicles containing NE |