Trospium Pharmacology

On this episode, I discuss trospium pharmacology, adverse effects, and important drug interactions you should know.

Trospium chloride (Sanctura) is a bladder antimuscarinic or anticholinergic. It blocks the action of acetylcholine in bladder smooth muscle. It is used for urinary frequency and overactive bladder. The immediate-release formulation is taken twice a day. There is an extended-release version that is more expensive.

As its classification suggests it is going to have anticholinergic effects that include dry eyes, dry mouth, constipation, urinary retention, GI tract slowing down, CNS sedation, and increased risk of falls. Compared to older bladder anticholinergics such as oxybutynin or tolterodine there is less CNS penetration. Hopefully, this will cause the patient to experience fewer CNS side effects. A downside to this being a newer medication is that it costs more.

Trospium is on the BEERS list. Look for medications started after the trospium that indicate anticholinergic side effects such as saliva substitutes, an increase in BPH medications, artificial tears, or constipation medications.

It should be administered on an empty stomach as food can block absorption. If the patient is currently taking it with food and seeing results there is no need to change how they are taking it.

Trospium is not metabolized by CYP enzymes minimizing drug interactions. Most interactions occur because of additive effects. Avoid using it with other medications on the BEERS list, especially other anticholinergic medications. Be cautious using other medications with sedative effects and CNS depression (benzodiazepines, sleep medications, opioids, alcohol) as they may have additive effects.

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Phenazopyridine Pharmacology

On this episode, I discuss phenazopyridine pharmacology, adverse effects, and potential drug interactions.

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NAPLEX Study Materials

BCPS Study Materials

BCACP Study Materials

BCGP Study Materials

BCMTMS Study Materials

Nursing Pharmacology (Amazon Highly Rated)

Guide to Drug Food Interactions (Amazon Best Seller)

Drug Interactions In Primary Care (Amazing Resource for Practicing Clinicians)

Perils of Polypharmacy (Great Resource for Those Who Work in Geriatrics)

Oxybutynin Pharmacology

On this episode, I discuss oxybutynin pharmacology, drug interactions, and adverse effects.

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

Support The Podcast and Check Out These Amazing Resources!

NAPLEX Study Materials

BCPS Study Materials

BCACP Study Materials

BCGP Study Materials

BCMTMS Study Materials

Nursing Pharmacology (Amazon Highly Rated)

Guide to Drug Food Interactions (Amazon Best Seller)

Drug Interactions In Primary Care (Amazing Resource for Practicing Clinicians)

Perils of Polypharmacy (Great Resource for Those Who Work in Geriatrics)

Tamsulosin Pharmacology

On this episode of the RLP podcast, I discuss tamsulosin pharmacology.

Tamsulosin inhibits alpha receptors which helps improve urine flow in patients with BPH.

As an off-label use, you may see tamsulosin used to try to aid in the passage of renal stones.

Tamsulosin concentrations may be increased by CYP3A4 inhibitors and reduced by CYP3A4 inducers.

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!

Mirabegron Pharmacology

Mirabegron is a beta-3 agonist that can help relax bladder smooth muscle and manage symptoms of overactive bladder.

Mirabegron inhibits CYP2D6 which can negatively impact the effectiveness of tamoxifen. I discuss this in greater detail in the podcast.

Tramadol and codeine effectiveness can be impacted by mirabegron. Be aware of this when using this medication.

By inhibiting CYP2D6, mirabegron can increase the concentrations of many psychotropic medications such as fluoxetine, aripiprazole, clozapine, and paroxetine. I discuss this further in this episode of the podcast.

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