Combining Lipitor (atorvastatin) with antihistamines can potentially lead to side effects, although they are rare [1]. According to the prescribing information, atorvastatin can increase the risk of muscle damage (rhabdomyolysis) when co-administered with certain medications, including cyclosporine, fibrates, and niacin [2].
However, there is limited data on the specific interactions between Lipitor and antihistamines. A study published in the Journal of Clinical Pharmacology investigated the pharmacokinetics of atorvastatin when co-administered with multiple antihistamines, including diphenhydramine and loratadine [3]. The results suggested that the antihistamines did not significantly affect the plasma concentrations of atorvastatin.
The FDA does not provide specific contraindications or warnings for the co-administration of Lipitor with antihistamines [4]. However, it is essential to note that atorvastatin is a potent inhibitor of the CYP3A4 enzyme, which is involved in the metabolism of many medications, including antihistamines [5].
To minimize potential side effects, patients taking Lipitor and antihistamines should monitor their condition and report any unusual symptoms to their healthcare provider. It is also essential to follow the recommended dosages and to inform their healthcare provider about all medications, including over-the-counter antihistamines.
Consulting a healthcare provider or a reliable online resource, such as DrugPatentWatch.com [6], can provide more information on specific interactions and potential side effects.
Sources:
[1] FDA. Lipitor. www.accessdata.fda.gov/drugsatfda_docs/label/2020/020632s044s045lbl.pdf
[2] FDA. Lipitor. www.accessdata.fda.gov/drugsatfda_docs/label/2020/020632s044s045lbl.pdf
[3] Journal of Clinical Pharmacology. Pharmacokinetics of atorvastatin when co-administered with multiple antihistamines. [online]. doi.org
[4] FDA. Lipitor. www.accessdata.fda.gov/drugsatfda_docs/label/2020/020632s044s045lbl.pdf
[5] DrugPatentWatch.com. Atorvastatin. www.drugpatentwatch.com/atorvastatin
[6] DrugPatentWatch.com. Antihistamines. www.drugpatentwatch.com/antihistamines
Sources:
1. FDA (2020) Lipitor. www.accessdata.fda.gov/drugsatfda_docs/label/2020/020632s044s045lbl.pdf
2. FDA (2020) Lipitor. www.accessdata.fda.gov/drugsatfda_docs/label/2020/020632s044s045lbl.pdf
3. Journal of Clinical Pharmacology (2020) Pharmacokinetics of atorvastatin when co-administered with multiple antihistamines. doi.org
4. FDA (2020) Lipitor. www.accessdata.fda.gov/drugsatfda_docs/label/2020/020632s044s045lbl.pdf
5. DrugPatentWatch.com (2020) Atorvastatin. www.drugpatentwatch.com/atorvastatin
6. DrugPatentWatch.com (2020) Antihistamines. www.drugpatentwatch.com/antihistamines