How to use it
Foundayo is taken once daily. It can be taken at any time of day, with or without food or water restrictions. Follow your care provider's instructions for use.
Dosing
Foundayo is available in six doses: 0.8 mg, 2.5 mg, 5.5 mg, 9 mg, 14.5 mg, and 17.2 mg. Patients typically start at 0.8 mg and increase every 30 days based on tolerability and treatment response. Your care provider will determine the right dose and schedule based on your health history and goals. Please also read the pharmaceutical packaging.
Side effects
Commonly reported side effects of this medication include:
- Nausea
- Constipation
- Diarrhea
- Vomiting
- Indigestion
- Stomach (abdominal) pain
- Headache
Other potential side effects:
- Swollen belly (abdominal distension)
- Fatigue
- Belching
- Heartburn
- Gas
- Hair loss
- Decreased appetite
- Gastroesophageal reflux disease
- Altered taste
These symptoms often subside as your body adjusts to the medication. Please notify your provider if side effects persist. For a complete list of side effects, review the medication packaging inserts.
Black Box Warning
Although rare, GLP-1 receptor agonists including Foundayo may cause thyroid C-cell tumors. Foundayo carries a "black box" warning for this risk. If you experience a lump or swelling in the neck, hoarseness, trouble swallowing, or shortness of breath, contact your healthcare provider immediately.
Do not take Foundayo if you have a personal or family history of medullary thyroid cancer or multiple endocrine neoplasia syndrome Type 2.
Precautions
Rapid weight loss can lead to muscle loss. To protect your muscle mass, it's important to incorporate strength training and regular exercise while taking Foundayo.
If you take oral birth control pills, talk to your healthcare provider before starting Foundayo. Birth control pills may be less effective while taking Foundayo — your provider may recommend an alternative form of contraception for 30 days after starting Foundayo and for 30 days after each dose increase.
If you are pregnant, planning to become pregnant, or breastfeeding, do not take Foundayo. A pregnancy exposure registry is available for women who take Foundayo during pregnancy — speak with your provider or contact Eli Lilly at 1-800-LillyRx.
If you are going under general anesthesia or deep sedation, inform your provider that you are taking Foundayo.
Interactions
Some drugs can interact with Foundayo, including:
- Insulin
- Sulfonylureas (which can cause blood sugar levels to drop dangerously low)
- Oral birth control pills
- Other GLP-1 receptor agonist medications, such as semaglutide, liraglutide, dulaglutide, or tirzepatide — use of Foundayo with other GLP-1 medications is not recommended
You should not drink alcohol while taking this drug, as alcohol can lower blood sugar and may cause dizziness or fainting when combined with Foundayo.







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