Terbinafine Pharmacology

Terbinafine can inhibit CYP2D6 which plays an important role in the metabolism of many drugs such as metoprolol, fluoxetine, and clozapine.

With terbinafine’s ability to inhibit CYP2D6, it can also increase the risk of treatment failure with drugs like tamoxifen.

When using anti-fungal drugs like terbinafine, remember that fungal infections can often require more time to treat.

Terbinafine has the potential to cause liver impairment. I discuss this further on the podcast.

I also discuss 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.

Acyclovir Pharmacology

On this episode “Acyclovir Pharmacology” I discuss the mechanism of action, important monitoring parameters, and drug interactions with acyclovir.

I discuss why acyclovir has to be dosed so many times per day.

Acyclovir can inhibit CYP1A2 which can impact a few drugs. I discuss a couple of those examples on this podcast episode.

GI effects are one of the more common side effects of acyclovir.

Rarely, neuropathy and nephropathy can be part of the adverse effect profile of acyclovir. I discuss this further on this episode.

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

Oseltamivir Pharmacology

Oseltamivir is an antiviral agent that is indicated for the treatment and prophylaxis of influenza.

It is important to remember that oseltamivir is cleared at least in part by the kidney and dose adjustments should be made based upon kidney function.

There is a low potential that oseltamivir could contribute to psych issues like delirium.

Probenecid has the potential to raise the concentrations of oseltamivir.

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

Rifampin Pharmacology

Rifampin is classified as an antibiotic and an antituberculosis agent. It primarily works by inhibiting bacterial RNA polymerase.

While not extremely common, rifampin is well known to cause hepatic dysfunction.

You should remind patients who are taking rifampin that it can alter the color of tears, sweat, saliva and urine. It can change these fluids to a reddish/brown color.

Rifampin is very well known for causing drug interactions. It is an enzyme inducer that can reduce the concentrations of numerous medications such as warfarin, apixaban, cyclosporin, levothyroxine, and oral contraceptives to name a few.

Rifampin can be used to help prevent meningococcal infection. Learn more on rifampin by listening to this podcast!

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