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Acyclovir Pharmacology

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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!

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Benzodiazepine Pharmacology

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Benzodiazepines act by enhancing the effect of GABA, an inhibitory neurotransmitter.

Benzodiazepines can cause confusion, sedation, and respiratory depression.

There are many potential indications for benzodiazepines. They can be used in anxiety, status epilepticus, insomnia, and alcohol withdrawal amongst other things.

There is a boxed warning for the use of opioids with benzodiazepines. The primary risk of the combination is respiratory depression.

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Celecoxib Pharmacology

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Celecoxib is easy to remember as its mechanism of action is “COX”-2 Inhibition. This can result in result in reduced prostaglandin formation and help with pain and inflammation.

Kidney function is important to monitor in our patient on celecoxib. It is especially important in patients taking ACE inhibitors, ARBs, and/or diuretics.

While GI bleed may be less likely with celecoxib compared to traditional NSAIDs like indomethacin and ibuprofen, it still needs to be monitored for.

Digoxin concentrations may be increased with the use of celecoxib.

Celecoxib is generally dosed twice per day as the half-life of the drug is in the ballpark of 10-12 hours.

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

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Oseltamivir Pharmacology

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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!

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Dolutegravir

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Dolutegravir is an integrase inhibitor that is used in the management of HIV infection/

Carbamazepine along with other enzyme inducers can substantially lower the concentrations of dolutegravir.

Dolutegravir can potentially increase blood sugars, this should be closely monitored in our patients with diabetes.

CNS adverse effects like insomnia and dizziness can happen with dolutegravir.

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

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Medroxyprogesterone Acetate Injection Pharmacology

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On this podcast episode, I cover medroxyprogesterone acetate injection pharmacology (DMPA or Depo-Provera)

Medroxyprogesterone acetate injection is given every three months for the prevention of pregnancy.

Medroxyprogesterone acetate has a boxed warning for its risk of causing low bone mineral density.

Classic enzyme inducers can cause lower concentrations of medroxyprogesterone which can potentially lead to contraceptive failure.

Examples of enzyme inducers that can lower concentrations of medroxyprogesterone include carbamazepine, phenytoin, rifampin, and some agents used in the management of HIV.

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

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Budesonide Formoterol Pharmacology

Budesonide and Formoterol Pharmacology

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Budesonide/formoterol inhalation is sold under the brand name Symbicort.

Budesonide/formoterol is a combination agent that is used in the management of COPD and asthma.

Budesonide/formoterol is a combination of an inhaled corticosteroid and long-acting beta-agonist.

GINA guidelines now allow for the use of budesonide/formoterol in the management of acute asthma exacerbation.

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

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Benztropine Pharmacology

Benztropine Pharmacology

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Benztropine is a highly anticholinergic medication that is primarily used for movement disorders.

Antipsychotics can cause extrapyramidal adverse effects that can help be managed with benztropine.

Because benztropine is highly anticholinergic, it can cause dry eyes, dry mouth, urinary retention, constipation and contribute to falls and confusion, particularly in our elderly population.

While benztropine is classified as an anti-Parkinson’s agent, it is rarely used for that indication as it has a high incidence of anticholinergic adverse effects (particularly at the doses that are required for benefit).

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

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Budesonide Pharmacology (Oral and Rectal Formulations)

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Budesonide is a corticosteroid that can be given orally or rectally for management of Crohn’s disease or ulcerative colitis.

Because budesonide has a high first pass metabolism, the relative impact of systemic effects may be less than other steroids like prednisone.

Remember that CYP3A4 inhibitors can increase the concentrations of budesonide. I discuss this further on the podcast.

Different dosage forms of budesonide (oral versus rectal) can be used for different reasons. The site of the inflammation in Ulcerative colitis can determine which dosage form is most appropriate.

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

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Cimetidine Pharmacology

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Cimetidine blocks histamine 2 receptors which can suppress acid production and reduce symptoms of heartburn.

One of the major downsides to cimetidine is that it has a ton of drug interactions. I discuss many of the common ones in this episode.

Cimetidine is one of a few drugs that has the potential to cause gynecomastia. I discuss the mechanism of this adverse effect in this episode.

Phenytoin concentrations can rise due to the use of cimetidine. I discuss this in the drug interactions section of this episode.

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