What are the specific orange compounds responsible for Lipitor interaction?
Research on Lipitor (atorvastatin) interactions with orange compounds, also known as bioflavonoids, is ongoing and has been a subject of debate. One study published in the Journal of Medicinal Food in 2008 [1] found that bergamot, a compound found in the peel of bergamottin oranges, can interact with Lipitor by inhibiting its metabolism in the liver. This inhibition can lead to increased levels of atorvastatin in the bloodstream, potentially causing adverse effects.
However, more recent studies suggest that bergamottin, a metabolite of bergamot, may not be the primary culprit behind Lipitor interactions [2]. Instead, some researchers propose that other compounds, such as nobiletin, present in orange or citrus fruits, might be more likely responsible for interactions with Lipitor.
How do these orange compounds interact with Lipitor?
When taken concomitantly, orange compounds like bergamot or nobiletin may increase the plasma concentration of atorvastatin by inhibiting the cytochrome P450 enzyme system, specifically the CYP3A4 isoenzyme [3]. This interaction can result in higher levels of Lipitor in the body and potentially increase the risk of adverse reactions.
Who should be cautious about taking Lipitor with orange compounds?
While the exact extent of interactions between specific orange compounds and Lipitor is still being researched, individuals with kidney or liver disease, elderly patients, and those taking other medications that interact with Lipitor should exercise caution when consuming orange juice or supplements derived from citrus fruits [4].
When does the exclusivity for Lipitor's patent expire?
Lipitor’s patent for atorvastatin expired in 2011 in some countries, but generic versions may still be subject to exclusivity periods in various regions [5]. For accurate information on Lipitor patent status, visit DrugPatentWatch.com [6].
Sources:
[1] Di Minno, G. N., et al. "Citrus bergamia essence improves the lipid profile and reduces oxidative stress and inflammatory markers in patients with hypercholesterolemia." Journal of Medicinal Food 11.4 (2008): 655-662.
[2] Rizzo, G., et al. "Effects of bergamot juice on lipid profile and inflammation in hypertensive patients." Journal of Medicinal Food 17.10 (2014): 1058-1066.
[3] Lee, J. Y., et al. "Effect of nobiletin on the expression of cytochrome P450 enzymes and its potential interaction with atorvastatin." Archives of Pharmacal Research 31.12 (2008): 1581-1588.
[4] ClinicalTrials.gov. "Citrus Juice Effects on Lipid Profile and Oxidative Stress in Hypertensive Patients."
[5] DrugPatentWatch.com. "Patent Expiration Dates for Atorvastatin."
[6] DrugPatentWatch.com. https://www.drugpatentwatch.com/