As we
move towards the end of the semester with finals just around the corner many
students will turn to stimulant drugs such as Adderall to aid in their last-minute
studying efforts. Adderall is taken typically for its ability to help with attention-deficit/Hyperactivity
disorder (ADHD). Once ingested it helps with focusing for longer durations of
time. Making it one of the most abused prescription drugs among college students
Adderall works by increasing the
activity of the neurotransmitters (NT) norepinephrine and dopamine by way of
amphetamine salts. These salts increase the release of the NT and decrease the
reuptake of these NTs once in the synaptic cleft. The stimulation of these two NT
helps increase a person’s focus and makes for more efficient studying by using
the sympathetic nervous system (SNS). As we learned in class, these two NT are
part of the SNS. The SNS upregulates processes like increasing heart rate, constricting
blood vessels, and sweating. The SNS also inhibits actions of the digestive processes
in the small intestine. The increased release and duration of these NT is the
reason people don’t feel hungry while on Adderall. In particular, dopamine is the
neurotransmitter that is released at the start of consuming a meal and signals to
the body that it is full or soon to be full. The increased dopamine tricks your
body into thinking it is full and explains the decrease in a person’s appetite.
The increased
activity of SNS does not explain the increased need for urination. In fact, SNS
does the opposite facilitating urine storage in the bladder. The exact mechanisms
for how Adderall acts as a diuretic are not well understood. Two theories include
inhibiting aldosterone and the body’s natural regulation to an increase in
blood pressure. Aldosterone helps regulate the water and sodium balance in the
body. When aldosterone is active it retains sodium thus retaining water. When
inhibited, increased levels of sodium are excreted along with water resulting
in less reabsorption and more excretion. (Chiu et al., 2014) Another possible mechanism is the fact that Adderall is a
stimulant that increases heart rate and blood pressure. This increase in blood
pressure may result in increased excretion of fluids by the body to try and
counterbalance the increase in blood pressure naturally and return to homeostasis.
However, at this point, no single mechanism has been identified as the primary
culprit in the increased need to urinate while trying to cram for exams. Adderall has other side effects like weight loss, dry mouth, and
References
A
lsberge, J. B., Lee, D. Y.,
& Jumper, J. M. (2022). Central serous chorioretinopathy associated with
Adderall (dextroamphetamine-amphetamine) and topical steroid use. American
Journal of Ophthalmology Case Reports, 26, 101482.
https://doi.org/https://doi.org/10.1016/j.ajoc.2022.101482
Fairman, R. T., Vu, M., Haardörfer, R., Windle, M., & Berg, C. J. (2021). Prescription stimulant use among young adult college students: Who uses, why, and what are the consequences? Journal of American College Health, 69(7), 767–774. https://doi.org/10.1080/07448481.2019.1706539
Chiu, H. F., Cheng, J. K., Lin, P. H., Chang, J. C., Chen, I. M., Lin, C. I., Chang, W. P., & Lin, C. H. (2014). A mechanistic study on urine retention in d-amphetamine addicts. The Chinese journal of physiology, 57(4), 171–181. https://doi.org/10.4077/CJP.2014.BAC198
Khan A, T. B. (2021). Routine Use of Prescription Adderall Leading to Non-cardiogenic Pulmonary Edema and Respiratory Failure. Cureus 13(7): e16371.
National
Center for Biotechnology Information (2022). PubChem Compound Summary for CID
3007, Amphetamine. Retrieved November 28, 2022 from https://pubchem.ncbi.nlm.nih.gov/compound/Amphetamine.
Often times you hear people say things like adderall is so similar to methamphetamine because the chemical structures of the drugs are nearly identical with the difference being a primary vs secondary amine group. However the physiological MOA differ. Although methamphetamine has many of the same functions as adderall it releases five times as much dopamine as adderall. This rush of dopamine is why a meth high can present as paranoid and hallucinating, similar to a schizophrenic. Excellent post Tyler, I enjoyed reading it!
ReplyDeleteGoodwin, J. S., Larson, G. A., Swant, J., Sen, N., Javitch, J. A., Zahniser, N. R., De Felice, L. J., & Khoshbouei, H. (2009, January 30). Amphetamine and methamphetamine differentially affect dopamine transporters in vitro and in vivo. The Journal of biological chemistry. Retrieved November 28, 2022, from https://www.ncbi.nlm.nih.gov/pmc/articles/PMC2631950/