Paracetamol and blood pressure control in 45211 patients treated for hypertension: a cross-sectional study from the swedish primary care cardiovascular database

Objective: Paracetamol (acetaminophen) is widely recommended for analgetic and antipyretic indications due to its perceived high safety. However, studies have shown contradicting results regarding the effect of paracetamol on blood pressure (BP). We aimed to study how regular paracetamol use could affect BP control in patients on antihypertensive mediation. Design and method: Data for 42 511 patients attending primary care and a documented diagnosis of hypertension before 2007 (to rule out new onset of hypertension) and with 1 or more BP measurements recorded 2007–2008 were collected from the Swedish primary care cardiovascular database (SPCCD). There were 8 367 paracetamol users, defined as 1 or more dispensed prescriptions 6 months prior to the last BP recorded, and 34 144 non-users of paracetamol. Target BP was set to <140/90 mm Hg. Dose-response relationships were examined by the number of defined daily doses (DDD) dispensed. Multivariate linear regression analyses accounted for potential confounders. Results: Paracetamol users were older, had higher creatinine levels, more often diabetes, cardiovascular diseases and musculoskeletal diseases, and lower educational level than non-users (all P < 0.001), but attained target systolic and diastolic BP to similar degrees (58 and 93% vs 58 and 92%, respectively). There were no relations between number of DDD and systolic and diastolic BP in paracetamol users, also when DDD deciles were evaluated to account for the low proportion of patients with high DDD dispensed (all R 2 <0.001). Sensitivity analyses including dispensed prescriptions of paracetamol 3 months before and 6 months after the first BP measurement provided similar results. Paracetamol had no impact on attaining target BP in subgroup analyses on patients with diabetes, musculoskeletal diseases, with concomitant use of NSAID, or in relation to number of antihypertensive medications (suggesting severity of hypertensive disease). Conclusions: Concomitant use of paracetamol does not impair the ability to reach target BP in hypertensive patients. No dose-response relationship was observed between dispensed prescriptions of paracetamol and BP.