These challenges were ultimately overcome through molecular modification, long-acting formulations, and a more sophisticated understanding of receptor pharmacology, including biased agonism and doseexposure relationships ( This historical trajectory strongly suggests that GLP-1 should not be viewed as an isolated success, but rather as a prototype for a much larger class of peptidereceptor systems whose translational potential remains unrealized
My advice to clinicians is to proactively discuss contraception when initiating GLP-1 therapies in women of child-bearing age, document pregnancy intentions, and give pre-conception wash-out advice as per FSRH guidelines, said Dr Cheung
As of mid-2025, retatrutide has not received MHRA marketing authorisation and is not available for prescription or purchase in the UK outside of approved clinical trials
FDA Compounding and the FDA: Questions and AnswersExplains that compounded drugs are not FDA-reviewed for safety, effectiveness or quality before dispensing, and the 503A/503B framework
The peptide is stable in gastric acid, which makes oral administration viable for gut-targeted applications, a property that distinguishes it from many other therapeutic peptides that degrade before reaching target tissue
Are cagrilintide and retatrutide FDA-approved