Weight loss at maximum dose
No direct head-to-head trial between injection and pill. Tirzepatide from a 72-week trial; oral semaglutide from a 68-week trial.
For a 240 lb person. Averages from separate clinical trials. Individual results vary substantially.
Monthly cost self-pay
The oral pill is dramatically cheaper. With insurance, both are typically ~$25/month.
List prices and manufacturer self-pay programs. Insurance coverage varies.
A head-to-head trial exists — but not for these two. SURMOUNT-5 compared tirzepatide injection with semaglutide injection (not the pill). Tirzepatide produced 20.2% vs 13.7% for the injection. No trial directly compares tirzepatide injection with oral semaglutide pill.
Beyond weight loss
Form
Heart benefit
Side effects
Usually peaks weeks 2–4, fades by week 8–12
The decision hinges on needle comfort, budget, and weight loss targets. Tirzepatide produces more weight loss through a dual-hormone mechanism, but requires weekly injections and costs 7x more self-pay. Oral semaglutide is affordable ($149/month), has proven cardiovascular protection, and avoids injections — but needs a 30-minute daily fast. Many people start with the pill and switch to the injection after 3–6 months if they want more weight loss.
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Built with agentic AI tools and not a substitute for medical advice
Last reviewed: June 2026