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Weight Loss Drug Comparison Index

Drug comparisons grouped by treatment.

Choose a comparison by drug name or the decision you are trying to make. Separate-trial figures need context; they are not head-to-head evidence.

Choose the right comparison

Your questionStart hereWhat it compares
Which weight-management brand?Zepbound vs WegovyBranded products, administration and access
How do the molecules differ?Tirzepatide vs semaglutideMechanisms and evidence across indications
What does retatrutide add?Retatrutide vs tirzepatideInvestigational triple agonism versus dual agonism
What about mazdutide?Mazdutide vs retatrutideTrial populations and country-specific availability
Pill or injection?Orforglipron / FoundayoThe oral drug’s evidence and practical questions

Read the evidence before ranking the drugs

  1. Match the indication and population. Diabetes and obesity trials answer different questions.
  2. Check the comparison. A randomized head-to-head study compares treatments directly; results from separate trials do not.
  3. Keep the endpoint and duration together. A weight-loss figure needs its dose, follow-up time and analysis method.
  4. Check practical constraints. Formulation, approved indication, eligibility and access belong in the conversation with your clinician.

For a personal-priorities framework, read which GLP-1 might fit your situation. For generic names, brands and development status, use the drug directory.

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