Rybelsus and Metformin: Is It Safe? Label, Studies
Commonly used together; Rybelsus was tested alongside metformin in its trials.
- Verdict
- Generally fine together
- Label names it
- No
- General caution
- Pills absorbed more slowly
Check a GLP-1 interaction
A quick look at Rybelsus
The half-life is about 1 week. After 7 d, half is gone, and about 3% remains after five half-lives (35 d).
In PIONEER 1, people with type 2 diabetes lost 3.7 kg over 26 weeks, compared with 1.4 kg on placebo.
Monthly prices are shown in US dollars, including the list price and self-pay offers taken from the maker's price page.
Sources: FDA label (DailyMed), healthsystemtracker.org, Novo Nordisk pricing, Novo Nordisk.
Rybelsus and metformin: the verdict
Generally fine together
The Rybelsus label uses these exact words in its drug interactions section:
“Semaglutide cause a delay of gastric emptying and thereby has the potential to impact the absorption of other oral drugs. Levothyroxine exposure was increased 33%”
Source: FDA DailyMed label.
What the Rybelsus label says
The Rybelsus label does not list Metformin. Those lines still apply to it.
| Named in the label | The risk | What the label tells doctors |
|---|---|---|
| Insulin or sulfonylureas | Low blood sugar | If you take insulin or a sulfonylurea, including glipizide or glimepiride, together with this medicine, low blood sugar becomes more likely. Your doctor may lower the doses of those medicines. |
| Oral medicines | Pills absorbed differently | It slows stomach emptying, which can change how other pills are absorbed. |
Source: Rybelsus label (DailyMed).
What studies show
- studied with metformin clinical trials
- metformin no change in levels
Source: FDA DailyMed label.
The practical rule
- Keep taking both as prescribed, and talk with your doctor if stomach upset continues.
- Tell whoever prescribes your GLP-1 about every pill you swallow, including this one.
- Ask your pharmacist if any of your pills need to remain at a steady level in the blood. They may need checks when you start treatment or raise the dose.
- Check your blood sugar more often during your first weeks.
Source: FDA DailyMed label.
Metformin with other GLP-1s
The drug interaction section of none of the 10 GLP-1 labels lists Metformin. Each pill you swallow has the same general caution, so the answer stays the same for the whole class.
The same question applies to Ozempic, Wegovy, Mounjaro, Zepbound, Trulicity.
Source: FDA DailyMed label.