However, they are known to cause a dopamine crash, which will lower the levels of dopamine even more than they were before consuming these alcoholic beverages or sweets. (emedicalhealth.net)
For example, Roborovskii hamsters are characterized by low levels of dopamine in the brain and high levels of locomotor activity (an indication of hyperactivity disorder) compared to other species of hamsters. (topdogtips.com)
Clinically depressed people with low levels of dopamine often see a shrinkage in penis size which seems to stop if they take a dopamine enhancer like L - dopa or mucuna pruriens or acetylcholine. (factsonhgh.com)