In the research context for separating the effect on central satiety vs peripheral lipolysis
The drugs also alter brain receptors to cut the urge to eat
Important considerations before combining these medications include: Absolute contraindications : The combination should be avoided in patients with cardiovascular disease, uncontrolled hypertension, hyperthyroidism, glaucoma, during or within 14 days of MAOI use, personal/family history of MTC or MEN2, pregnancy, breastfeeding, or severe gastrointestinal disease Cardiovascular risk assessment : Phentermine increases heart rate and blood pressure, which requires careful monitoring with baseline and follow-up measurements of vital signs and possibly EKG if cardiac history exists Gastrointestinal tolerability : Tirzepatide commonly causes nausea, vomiting, and diarrhea, which may be compounded by phentermine's effects Medication interactions : Tirzepatide may reduce the effectiveness of oral contraceptives during initiation and dose escalation
The REDEFINE trials showed the combination produces approximately 22.7% body weight reduction, significantly more than either peptide alone
[DOI] [PubMed] [Google Scholar] 89.Gimpl G., Fahrenholz F
