10 Things You Need to Know Before Starting a GLP-1

GLP-1 medications such as semaglutide and tirzepatide can support weight loss and blood sugar control, but knowing what to expect can make the experience safer and more manageable. Before your first dose, understand the potential side effects, nutrition needs, costs, and importance of ongoing medical guidance.

1. Understand How GLP-1 Medications Work

These medications act on hormone pathways involved in appetite and blood sugar regulation. They can help you feel fuller and reduce hunger, while some also slow stomach emptying. This is one reason large or high-fat meals may feel uncomfortable for some people.

2. Don't Rush Your Dose

GLP-1 medications are generally started at a low dose and increased gradually according to the specific medication's prescribing instructions. Increasing too quickly can worsen nausea, vomiting, and other digestive side effects. Follow your prescribed schedule rather than trying to speed up weight loss.

3. Prioritize Protein and Muscle Health

Weight loss can include both fat and lean mass. Eating enough protein and incorporating resistance training, when appropriate, can help support muscle maintenance. Your protein needs depend on factors such as body weight, age, activity, and medical history, so ask your healthcare provider or dietitian for an appropriate target.

4. Prepare for Digestive Side Effects

Nausea, constipation, diarrhea, and vomiting are possible side effects. Eating smaller meals, eating slowly, stopping when comfortably full, and drinking fluids regularly may help. Increase fiber gradually if tolerated. Contact your provider if symptoms persist or make it difficult to eat or drink.

5. Understand the Cost Before Starting

Medication prices and insurance coverage vary. Check your insurance formulary, eligibility requirements, prior authorization rules, and out-of-pocket costs before starting. If considering a compounded medication, discuss its risks and quality with a qualified healthcare professional; compounded drugs are not FDA-approved.

6. Have a Long-Term Plan

GLP-1 treatment may need to continue long term. In an extension of the STEP 1 semaglutide trial, participants regained an average of about two-thirds of their previous weight loss within a year of stopping treatment. Individual outcomes vary, but the findings highlight the importance of planning for ongoing care. Read the study.

Never stop or change your medication without discussing your options with your prescriber.

7. Tell Your Surgical Team Before a Procedure

GLP-1 medications can delay stomach emptying, which may affect anesthesia and sedation. Tell your surgeon and anesthesia team that you're taking one. Whether to continue or temporarily withhold treatment depends on your individual risk and the procedure; don't automatically stop it two weeks beforehand without medical guidance. Read the multisociety guidance.

8. Don't Obsess Over Daily Scale Changes

Weight can fluctuate because of fluid retention, sodium intake, digestion, and other factors. A few days without a change doesn't necessarily mean treatment has stopped working. Look at longer-term trends and other meaningful measures of progress, and discuss persistent plateaus with your provider before making dose changes.

9. Know the Important Warning Signs

GLP-1 medications aren't suitable for everyone. For example, certain semaglutide and tirzepatide products carry a contraindication for people with a personal or family history of medullary thyroid carcinoma or multiple endocrine neoplasia syndrome type 2 (MEN2). Tell your clinician about your medical history and other medications.

Seek urgent medical attention for severe, persistent abdominal pain, especially if it spreads to your back, or for signs of a serious allergic reaction. Persistent vomiting or an inability to keep fluids down also requires prompt medical assessment.

10. Choose Qualified Medical Support

A prescription should come with appropriate screening, dosing instructions, follow-up, and a way to report side effects. Your clinician can determine which checks are appropriate for you based on your medical history and treatment. Be cautious of services that supply medication without proper evaluation or ongoing support.

The Bottom Line

GLP-1 medications can be valuable tools for weight management, but they work best as part of a treatment plan tailored to your needs. Understanding your medication, protecting your nutrition, monitoring side effects, and staying connected with your healthcare team can help you make informed decisions throughout your journey.

Disclaimer: This article is for educational purposes only and is not a substitute for individualized medical advice. Always consult a qualified healthcare professional before starting or changing medication.