Serum cholesterol increase in statin users associated with antibiotic use: Case-crossover study

Area of Science:

• Pharmacology
• Microbiology
• Cardiovascular Medicine

Background:

• Statins (HMG-CoA reductase inhibitors) are crucial for managing atherosclerotic disease.
• Statin absorption relies on secondary bile acids produced by gut microbiota.
• Disruptions to gut microbiota, such as by antibiotics, may impair statin efficacy.

Purpose of the Study:

• To investigate the association between antibiotic treatment and elevated cholesterol levels in patients using statins.
• To test the hypothesis that antibiotic-induced changes in gut microbiota reduce statin absorption and effectiveness.

Main Methods:

• A case-crossover study design was employed, using individuals as their own controls.
• The study analyzed data from adherent statin users within Clalit Health Services.
• Exposure was defined as antibiotic prescriptions within three months preceding LDL-C measurements.

Main Results:

• A significant association was observed between increased LDL-C and exposure to macrolides and clindamycin (OR = 1.237, p = 6.5*10^-7).
• No association was found between LDL-C increase and antiviral treatments or antibiotic use in non-statin users.
• An increased LDL-C was secondarily associated with subsequent atherosclerotic ischemic events.

Conclusions:

• Precedent treatment with macrolides or clindamycin is associated with increased LDL-C in highly adherent statin users.
• This interaction may impact the effectiveness of statin therapy in managing cholesterol levels.