Promethazine (Phenergan) Pharmacology Podcast

In this promethazine pharmacology podcast, I discuss its mechanisms of action, side effects, important drug interactions, and much more.

Promethazine has anticholinergic and dopamine-blocking activity which contributes to the adverse effect profile as well as its efficacy.

There is a boxed warning with promethazine to avoid the use of this medication in patients under the age of 2 due to respiratory depression.

Promethazine IV is considered a high-risk route of administration and should be avoided if possible.

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Scopolamine Pharmacology

In this episode of the RLP podcast, I discuss scopolamine pharmacology.

Scopolamine patches can be used in the management of motion sickness and surgery/anesthesia induced nausea and vomiting.

Transdermal scopolamine has a slow onset of action so we need to be deliberate about the timing of placement (usually 4-6 hours prior to anticipated time of symptoms).

Transdermal scopolamine is highly anticholinergic and can cause dry eyes, dry mouth, urinary retention, and confusion.

I discuss important drug interactions on the podcast, be sure to check out my latest project which is a 200+ page book on managing drug interactions in primary care.

Be sure to check out our free Top 200 study guide – a 31 page PDF that is yours for FREE!

Prochlorperazine Pharmacology

Prochlorperazine has several potential mechanisms of action. It can block dopamine and alpha receptors as well as have anticholinergic effects.

Prochlorperazine is classified as an antipsychotic and antiemetic. It is very seldom used as an antipsychotic in clinical practice and more used for its antiemetic effects.

Because of the anticholinergic activity of prochlorperazine, there is potential for dry mouth, dry eyes, urinary retention, constipation, and other anticholinergic effects.

Prochlorperazine does have the potential to have some alpha blocking activity. Keep an eye out for hypotension in patients who may be at risk.

Be sure to check out our free Top 200 study guide – a 31 page PDF that is yours for FREE!

Ondansetron Pharmacology

Ondansetron (Zofran) is a medication used for nausea and vomiting. In this episode, I lay out the pharmacology, adverse effects, drug interactions and more!

Ondansetron has been reported to increase the risk of serotonin syndrome. I discuss this further on the podcast.

Ondansetron can exacerbate QTc prolongation. Keep an eye out for patients who may have risk factors or be on other medications that can contribute to this. I discuss this further on this podcast.

Ondansetron is often used for chemotherapy induced nausea and vomiting. I discuss this and other indications on the podcast.

Be sure to check out our free Top 200 study guide – a 31 page PDF that is yours for FREE!