Answer
Yes, bullous pemphigoid is a reported side effect of metformin + sitagliptin (Janumet), identified through post-marketing surveillance, with a frequency that cannot be estimated from available data.
Sources for this answer
- Janumet 50 mg/1000 mg film-coated tabletsMerck Sharp & Dohme (UK) Limited · emc · SmPC §4.8 Undesirable effects · Version 26Document updated
Sources checked