Drugs that promise rapid and effortless weight loss once seemed like the stuff of fairytales. Now, even if we’re not “on the pen” ourselves, most of us know someone who is taking the much-hyped GLP-1 agonist injectables – better known by the brand names Wegovy,

U.K. regulators issued guidance on Thursday, warning weight loss and diabetes medications may weaken the effectiveness of birth control and may be harmful in pregnancy.