GLP-1 Medication FAQ

Blood sugar: Improvements can be seen within the first 1-2 weeks of starting treatment.

Weight loss: Typically becomes noticeable after 4-8 weeks. Most patients see significant results by 3-6 months.

Maximum effects: Usually achieved after reaching the maintenance dose, which takes 16-20 weeks due to the gradual titration schedule designed to minimize side effects.

The gradual dose titration (starting low and increasing slowly) is designed to minimize gastrointestinal side effects like nausea and vomiting. Starting at the full dose would cause severe GI symptoms in most patients. The initiation doses (0.25 mg for semaglutide, 2.5 mg for tirzepatide) are not therapeutic — they're meant to help your body adjust.

For weekly injections (Ozempic, Wegovy, Mounjaro, Zepbound):

• If less than 5 days have passed: Take the dose as soon as possible
• If more than 5 days have passed: Skip the missed dose and take the next dose on your regular day
• Never take two doses at once

For daily medications (Rybelsus, Victoza): Skip the missed dose and take the next dose as scheduled.

Yes, you can change the day of the week you inject, as long as there are at least 2 days (48 hours) between doses. For example, if you normally inject on Sundays but want to switch to Fridays, you can make the change as long as it's been at least 2 days since your last injection.

Results vary significantly between individuals. Based on clinical trials:

• Ozempic (2 mg): 12-14 lbs average (diabetes population)
• Wegovy (2.4 mg): 15-17% of body weight (about 35 lbs for someone starting at 200 lbs)
• Mounjaro (15 mg): 15-25 lbs (diabetes), up to 25% in weight loss studies
• Zepbound (15 mg): 20-22% of body weight

Your results depend on: starting weight, dose achieved, diet and exercise habits, individual metabolism, and how long you take the medication.

Unfortunately, yes — studies show most patients regain a significant portion of lost weight within 1-2 years of stopping. The STEP 1 extension trial found participants regained about two-thirds of their weight loss one year after stopping semaglutide.

This is why GLP-1 medications are considered chronic treatments for obesity, similar to how blood pressure medications are chronic treatments for hypertension. Discuss long-term plans with your doctor.

Weight loss plateaus are common and can occur for several reasons:

• Metabolic adaptation: As you lose weight, your body requires fewer calories
• Not at maximum dose yet: Higher doses produce more weight loss
• Dietary drift: Eating habits may have gradually increased
• Natural variation: Weight fluctuates daily; look at trends over weeks

If you've plateaued at a lower dose, your doctor may increase to the next dose level. If you're already at the maximum dose, focus on maintaining your current loss.

Moderate alcohol consumption is generally not prohibited, but consider:

• Alcohol may worsen nausea, especially early in treatment
• Alcohol can cause low blood sugar (hypoglycemia) in people with diabetes
• Reduced food intake may make alcohol affect you more strongly
• Many patients report reduced interest in alcohol while on GLP-1 medications

Discuss your specific situation with your doctor, especially if you have diabetes or liver concerns.

Yes. GLP-1 medications are approved as an "adjunct to diet and exercise" — they work best when combined with healthy lifestyle changes. The clinical trials that showed impressive results included lifestyle counseling for all participants.

That said, the medications make it easier to eat less by reducing appetite and cravings. Many patients find they can finally stick to healthy eating habits that were impossible before.

Focus on:

• Protein: Helps preserve muscle mass during weight loss
• Vegetables: Nutrient-dense and filling
• Smaller portions: Your appetite will be reduced
• Hydration: Drink plenty of water

Avoid or limit: fatty/greasy foods (worsen nausea), large meals, carbonated beverages, and lying down after eating.

Yes, and exercise is encouraged! However:

• If you have diabetes, monitor blood sugar as your needs may change
• Stay well hydrated, especially if experiencing GI side effects
• Ensure adequate protein intake to preserve muscle mass
• Consider strength training to maintain muscle during weight loss

GLP-1 medications should be stopped at least 2 months before planned pregnancy due to potential fetal risks seen in animal studies. Use effective contraception while taking these medications.

Interestingly, weight loss from GLP-1 medications may improve fertility in women with PCOS or obesity-related infertility. If you become pregnant while taking a GLP-1, stop the medication immediately and contact your doctor.

GLP-1 medications are not recommended during breastfeeding due to unknown effects.

GLP-1 medications slow gastric emptying, which can increase the risk of aspiration during anesthesia. Many anesthesiologists recommend:

• Hold the medication for at least 1 week before elective surgery
• Some recommend 2-3 weeks for longer-acting formulations
• Follow a liquid diet 24 hours before surgery

Always inform your surgical team that you take a GLP-1 medication, and follow their specific instructions.

Based on available data:

• Thyroid tumors: Observed in rodents but not confirmed in humans. Still, avoid if you have MTC/MEN2 history.
• Pancreatitis: Small increased risk; monitor for symptoms
• Gallbladder disease: Increased risk, likely related to rapid weight loss
• Cardiovascular: Actually beneficial — SELECT trial showed 20% reduction in CV events

Semaglutide has been studied for over 7 years. Longer-term data continue to accumulate.

GLP-1 medications have relatively few drug interactions, but important ones include:

• Insulin/sulfonylureas: Increased hypoglycemia risk — doses may need reduction
• Oral medications: Slowed gastric emptying may affect absorption of some drugs
• Oral contraceptives: May have reduced absorption; consider backup methods during initial titration

Always tell your doctor about all medications you take, including supplements.

They're the same active ingredient (semaglutide) from the same manufacturer (Novo Nordisk). The differences:

• Ozempic: FDA-approved for type 2 diabetes, max dose 2 mg
• Wegovy: FDA-approved for weight loss, max dose 2.4 mg

Insurance coverage and cost may differ based on which indication you're prescribed for.

Mounjaro (tirzepatide) has shown greater A1C reduction and weight loss than Ozempic (semaglutide) in head-to-head trials. However, "better" depends on your situation:

• Mounjaro advantages: More potent for blood sugar and weight loss
• Ozempic advantages: Longer track record, proven cardiovascular benefit (SUSTAIN 6), more widely available

Both are excellent options. Your doctor can help determine which is best for you based on your health history and insurance coverage.

Yes, switching between GLP-1 medications is possible and sometimes done for various reasons (side effects, insurance coverage, better efficacy). Your doctor will determine the appropriate starting dose on the new medication based on what dose you were taking previously. You typically don't need to re-titrate from the lowest dose.