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I created the Learn PK/PD site in May 2010 in response to a communication issue that I was facing in my daily work in the world of clinical pharmacology and pharmacokinetics. In my first post, I stated the reason for creating my blog and the website: My blog is dedicated to providing clear, concise, accurate, and […]
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Mass balance studies are also called “C-14 studies” or “Absorption, Metabolism, and Excretion (AME) studies”. It is important to understand what you are trying to learn from the experiment. The primary objectives of a mass balance study are generally: To determine the mass balance of drug-related material following dose administration To determine the ratio of […]
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After a much longer delay that I expected, I am back to blogging on a regular basis. Today I want to discuss a common topic among clinical pharmacologists. How do you properly design a drug-drug interaction study? Defining Drug-Drug Interactions While these studies may appear complicated, they can be simplified very quickly to make the […]
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Drug-drug interactions are a critical research area in pharmaceutical drug development. One of the most tragic examples of drug-drug interactions was the antihistamine terfenadine. Terfenadine (also known as Seldane) was a common antihistamine intended to block the effects of an allergic rhinitis. Upon administration terfenadine is metabolized to fexofenadine by the cytochrome P450 3A4 isoform. […]
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The primary purpose of a clinical trial is to address a scientific hypothesis. To address a hypothesis, different statistical methods are used depending on the type of question to be answered. Most often the hypothesis is related to the effect of one treatment as compared to another. For example, one trial could compare the effectiveness […]
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