What to Know Before Starting a GLP-1 Medicine

Deciding to start a weight-loss medicine can bring relief, questions, and some nerves. You may have heard about someone else's results and wondered what the experience would be like for you. Before the first dose, it helps to understand how treatment will fit into your health and everyday life.

This article covers adult weight management, using semaglutide (Wegovy) and tirzepatide (Zepbound) as examples. Instructions depend on the product prescribed. Wegovy prescribing information, Zepbound prescribing information

Start with your health history and goals

For weight management, clinicians commonly consider prescription medicine for adults with a body mass index, or BMI, of 30 or higher, or 27 or higher with a weight-related condition such as high blood pressure. Meeting a threshold starts the assessment; your health history, other medicines, and treatment goals also matter. NIDDK guidance

Be specific about what you hope will change. Is weight affecting your ability to move comfortably? Are you hoping to improve a health condition? That conversation gives you and your clinician something meaningful to revisit as treatment progresses.

Bring a complete list of prescriptions, over-the-counter medicines, and supplements. Mention past pancreatitis, gallbladder or kidney problems, severe stomach-emptying problems, diabetes-related eye disease, and medication allergies. These details can change the assessment and monitoring plan. Semaglutide patient information

Wegovy and Zepbound must not be used if you have a personal or family history of medullary thyroid carcinoma (a specific thyroid cancer), or if you have multiple endocrine neoplasia syndrome type 2 (MEN2). A previous serious allergic reaction to a medicine's active ingredient or other ingredients also rules that product out. Ask your clinician how any thyroid diagnosis or medication allergy affects treatment. Wegovy contraindications, Zepbound contraindications

If you take insulin or a sulfonylurea for diabetes, the clinician may need to adjust treatment to reduce the risk of low blood sugar. Ask what to watch for and how to respond. Wegovy precautions

Check for overlapping medicines, too. Wegovy and Zepbound should not be combined with another product containing the same active ingredient or with another GLP-1 receptor agonist. Make sure the prescriber knows about any weight-loss or diabetes treatment you already use. Wegovy limitations of use, Zepbound limitations of use

Discuss pregnancy plans before treatment starts

Discuss pregnancy plans and breastfeeding before starting. These medicines should not be used for weight loss during pregnancy. Breastfeeding advice depends on the product and formulation: Wegovy's label specifically advises against breastfeeding during treatment with its tablets. Discuss an appropriate treatment and feeding plan with your clinician. Wegovy pregnancy and breastfeeding guidance, Zepbound pregnancy and breastfeeding guidance

For planned pregnancy, Wegovy's prescribing information says to stop it at least two months beforehand. Wegovy planning guidance

Zepbound can reduce the effectiveness of oral hormonal birth control. Its label advises switching to a nonoral method or adding a barrier method for four weeks after starting and four weeks after each dose increase. Discuss this with your clinician. Zepbound contraception guidance

The first dose is the beginning of a process

Treatment starts at a lower dose and increases gradually to help reduce gastrointestinal side effects. Discuss tolerability with your prescriber; do not speed up the increases yourself. Wegovy dosing guidance, Zepbound dosing guidance

Before leaving with the prescription, make sure you understand how to take or administer your exact product, how to store it, and what to do about a missed dose. Have the pharmacist walk you through anything unclear. Keep the product's instructions somewhere you can find them again.

Tell any surgery or anesthesia team that you use the medicine. Delayed stomach emptying can matter during anesthesia or deep sedation. Zepbound procedure precautions

Less hunger still requires a plan for eating

If your appetite becomes smaller, the food you do eat still needs to provide enough nourishment. A joint advisory from four medical and nutrition organizations emphasizes assessing nutrition before treatment, preventing nutrient deficiencies, and combining adequate protein with strength training to help preserve muscle. Joint nutrition advisory summary

Ask what that could look like with your food preferences, budget, and physical abilities. A dietitian can help tailor the plan if one is available to you. Tell the care team if eating becomes difficult or you are repeatedly skipping meals because you feel unwell.

Know which symptoms need help

Nausea, vomiting, diarrhea, and constipation are possible side effects. Contact your clinician if symptoms are severe or do not settle. Repeated vomiting, trouble keeping fluids down, or reduced urination need prompt attention because dehydration can become serious. Patient information and precautions

Persistent, severe abdominal pain—especially pain spreading to the back, with or without vomiting—needs urgent medical assessment. Trouble breathing or swelling of the tongue or throat calls for emergency help. These are examples, not a complete warning list; read the Medication Guide supplied with your prescription. Serious symptoms

Make a plan for the months after the first prescription

Ask when the first follow-up will happen, who handles questions between visits, and how you will assess progress together. Include the practical side: what insurance covers, the ongoing medicine cost, and whether appointments or tests add separate charges. Coverage varies, so check your own plan. NIDDK treatment guidance

Know what product you are receiving and which pharmacy supplies it. FDA recommends a prescription from a doctor and a state-licensed pharmacy; compounded medicines do not undergo FDA approval for safety, effectiveness, and quality before marketing. FDA guidance

Weight-management medicine may be a long-term treatment, and some weight regain is likely after stopping. Discuss affordability and continuity early, including what you would do if treatment became unavailable. NIDDK guidance on duration

You should leave the starting conversation knowing how to take the medicine, who to contact with a problem, and when you will check in again. Those arrangements make the first prescription part of an ongoing care plan.