Weight-Loss Injections: What to Know Before You Start
In recent years, injectable weight-loss medications (from the family of drugs that act on satiety hormones such as GLP-1) have become extremely popular. These medications can reduce appetite and produce meaningful weight loss, but they are prescription drugs, and using them without medical supervision is dangerous.
Who Is a Candidate for Medication?
Clinical guidelines usually consider medication for obesity in people with a body mass index (BMI) of 30 or higher, or a BMI above 27 together with a weight-related condition (such as type 2 diabetes, high blood pressure or high blood lipids). The final decision is made by a doctor after an examination and a review of lab results. Calculate your BMI here.
Common Side Effects
- Nausea, vomiting, diarrhea or constipation, especially in the first weeks and when the dose is increased
- Feeling full early and reduced appetite
- In rare cases: pancreatitis, gallbladder problems and dehydration
Any severe or persistent abdominal pain should be reported to a doctor immediately.
Who Should Not Use Them?
Pregnancy and breastfeeding, a personal or family history of certain thyroid cancers, and a history of pancreatitis are among the situations in which doctors usually rule out these drugs or consider them only with great caution. Only your doctor can determine the full list based on your medical history.
Muscle Loss: The Risk People Talk About Less
With rapid weight loss, part of the weight lost is muscle. Losing muscle lowers your metabolism and increases the chance of regaining weight. That is why, alongside medication, you should:
- Do at least two to three strength training sessions a week.
- Eat enough protein (usually 1.2 to 1.6 grams per kilogram of body weight, as advised by your doctor or dietitian).
- Track your waist size and body fat percentage, not just the number on the scale.
What Happens After Stopping the Medication?
Studies have shown that a significant portion of the lost weight returns after the medication is stopped, unless eating and exercise habits have become sustainable. Medication is a supporting tool, not a substitute for lifestyle.
In ProGym's medication and injection consultation section, you can send your question to a doctor along with your body measurements and latest lab results. ProGym does not provide doses or prescriptions, and treatment decisions always rest with your own doctor.
Frequently asked questions
Who can use weight-loss injections?
Clinical guidelines usually consider medication for people with a BMI of 30 or more, or a BMI above 27 with a weight-related condition such as type 2 diabetes or high blood pressure. The final decision rests with a doctor.
What are the common side effects of injectable weight-loss drugs?
Nausea, vomiting, diarrhea or constipation and feeling full early are common, especially in the first weeks. In rare cases, pancreatitis and gallbladder problems have also been reported.
Why is strength training important alongside weight-loss injections?
With rapid weight loss, part of the weight lost is muscle, which lowers your metabolism. Two to three strength sessions a week and enough protein help preserve muscle.
Does the weight come back after stopping weight-loss injections?
Studies show that a significant portion of the lost weight returns after stopping the medication, unless eating and exercise habits have become sustainable.
Workout and nutrition plans matched to your goal and level, free.