4 Questions to Ask Your Doctor Before Starting GLP-1 Therapy

About 1 in 8 American adults has now tried a GLP-1 medication, according to a 2025 KFF survey. But many start without fully understanding what they are getting into. The right conversation with your doctor before that first injection can set you up for success and help you avoid surprises. Here are four questions worth asking.

1. What Is My Realistic Timeline for Results, Given My Specific Health Profile?

Generic timelines from drug commercials do not apply to everyone. Your starting A1C, BMI, insulin resistance level, and other medications all affect how quickly you will see changes. Ask your doctor to estimate when you should expect to see measurable blood sugar improvements and how much change would be considered a good response. For example, someone with an A1C of 9.5% might see a 1-point drop in three months, while someone at 7.5% might see a 0.5-point drop. Having specific benchmarks prevents discouragement. Also ask when you should come back for follow-up labs so you can track progress objectively rather than guessing.

Why it matters for your metabolic age: setting clear benchmarks means you can track whether your metabolic age is improving at the expected pace, giving you and your doctor a shared reference point.

2. How Will This Medication Interact With Everything Else I Am Taking?

GLP-1 drugs slow gastric emptying, which can change how your body absorbs other medications. Birth control pills, thyroid medications, and blood pressure drugs may all be affected. If you take insulin or sulfonylureas, there is a real risk of hypoglycemia that needs to be managed through dose adjustments. Some psychiatric medications, particularly certain antipsychotics and antidepressants, can counteract the metabolic benefits of GLP-1 therapy. Bring a complete list of every medication, supplement, and vitamin you take. Your doctor may need to adjust timing or doses of other drugs. This is not a formality. It is a safety issue that directly affects how well the GLP-1 medication works.

Why it matters for your metabolic age: unaddressed drug interactions can undermine blood sugar and blood pressure improvements, which means your metabolic age may not improve as expected.

3. What Is the Plan If Side Effects Become Unmanageable?

Nausea, vomiting, diarrhea, and constipation are the most common side effects of GLP-1 drugs, affecting up to 44% of users in clinical trials. For most people, these symptoms improve after a few weeks. But for some, they persist. Ask your doctor in advance what the protocol is if side effects are severe. Will they slow the dose titration? Switch you to a different GLP-1 medication? Add anti-nausea medication? Knowing the backup plan before you need it reduces anxiety and prevents you from abandoning treatment prematurely. Also ask about the rare but serious risks, including pancreatitis and thyroid C-cell tumors, so you know the warning signs to watch for.

4. What Happens If I Need to Stop Taking This Medication?

This is the question most people forget to ask, and it matters enormously. Studies consistently show that blood sugar and weight tend to rebound after stopping GLP-1 therapy. Ask your doctor what the exit strategy looks like. Will you taper off gradually? What lifestyle habits should you establish now to protect your progress? Are there alternative medications that could serve as a bridge? Understanding the long-term plan from day one helps you make better decisions throughout treatment. Some doctors now recommend building a solid exercise routine and dietary pattern during the first six months of GLP-1 therapy, specifically so patients have a foundation if they eventually discontinue.

Why it matters for your metabolic age: having a discontinuation plan protects your metabolic health gains and prevents your metabolic age from climbing back up after stopping medication.

Know Your Starting Point

Before your appointment, get a clear picture of where your metabolic health stands. Your metabolic age combines blood sugar, blood pressure, BMI, and age into one number that gives both you and your doctor a useful baseline.

Find out your metabolic age in 60 seconds – free.