Randomized crossover study shows regular use of Paracetamol increases systolic blood pressure by approximately 5 mm Hg when compared with placebo in hypertensive individuals.

Regular Acetaminophen Use and Blood Pressure in People With Hypertension: The PATH-BP Trial – Circulation (link to abstract – $ for full-text)

Commentaries:

Regular paracetamol use linked to higher blood pressure, study finds – University of Edinburg

Expert reaction to study looking at regular, long-term paracetamol use and blood pressure, in people with high blood pressures – Science Media Centre

Blood pressure warning over long-term paracetamol use – BBC