What Are GLP-1 Medications?

Understanding GLP-1: The Basics

GLP-1 stands for glucagon-like peptide-1, a hormone naturally produced in your gut after eating. This hormone plays several critical roles in your body: it signals your brain that you're full, slows down how quickly food leaves your stomach, and helps regulate blood sugar by stimulating insulin release. In healthy individuals, GLP-1 is part of the complex system that keeps appetite and metabolism in balance.

GLP-1 receptor agonists are medications that mimic this natural hormone, but they're engineered to last much longer. While your body's natural GLP-1 breaks down within minutes, medications like semaglutide and tirzepatide remain active for days — providing sustained appetite suppression and metabolic benefits with just one weekly injection.

How GLP-1 Medications Work for Weight Loss

GLP-1 medications work through multiple mechanisms simultaneously, which is what makes them so effective for weight management:

• 1
  Appetite suppression. GLP-1 agonists act on receptors in the brain's hypothalamus, reducing hunger signals and increasing feelings of fullness. Many patients describe a dramatic reduction in "food noise" — the constant mental preoccupation with eating that makes traditional diets so difficult.
• 2
  Delayed gastric emptying. These medications slow the rate at which food moves from your stomach to your small intestine. This means you feel full longer after eating, naturally reducing portion sizes and caloric intake without the willpower battle.
• 3
  Blood sugar regulation. GLP-1 agonists stimulate insulin release when blood sugar is elevated and suppress glucagon secretion, helping maintain stable blood sugar levels. This reduces cravings and energy crashes that often lead to overeating.
• 4
  Metabolic improvements. Beyond weight loss, GLP-1 medications have been shown to improve cardiovascular health markers, reduce inflammation, and lower blood pressure — benefits that extend well beyond the number on the scale.

The Main GLP-1 Medications

Several GLP-1 receptor agonists are currently available, but two dominate the weight loss landscape:

Who Are GLP-1 Medications For?

GLP-1 medications are typically prescribed for adults who meet one or more of the following criteria:

• BMI of 30 or higher (classified as obesity)
• BMI of 27 or higher with at least one weight-related health condition such as type 2 diabetes, high blood pressure, high cholesterol, or obstructive sleep apnea
• Type 2 diabetes that is not adequately controlled with other medications

A licensed healthcare provider will evaluate your medical history, current medications, and health goals to determine if GLP-1 therapy is appropriate for you. Many compounding pharmacies partner with telehealth providers who can conduct this evaluation remotely.

What to Expect When Starting Treatment

GLP-1 treatment follows a gradual titration schedule — you start at a low dose and increase over several weeks to minimize side effects. Here's a typical timeline:

Common Side Effects

The most frequently reported side effects are gastrointestinal and typically improve over time:

• Nausea — the most common side effect, especially during dose increases. Eating smaller meals and avoiding greasy foods helps significantly.
• Constipation or diarrhea — staying well-hydrated and eating fiber-rich foods can help.
• Decreased appetite — this is also the desired effect, but some patients may need reminders to eat enough to get adequate nutrition.
• Injection site reactions — mild redness or bruising at the injection site that typically resolves within days.

Serious side effects are rare but can include pancreatitis, gallbladder issues, and allergic reactions. Always discuss risks with your healthcare provider before starting treatment. Learn more about managing side effects in our storage and handling guide.

The Role of Compounding Pharmacies

Brand-name GLP-1 medications can cost over $1,000 per month without insurance, and widespread shortages have made them difficult to obtain. Compounded versions use the same active ingredients but are prepared by licensed compounding pharmacies at a fraction of the cost — often starting as low as $99/month for semaglutide.

Compounding also enables custom formulations not available from brand manufacturers, such as semaglutide combined with B12 for energy support, or tirzepatide with NAD+ for cellular health. Choosing a reputable pharmacy is critical — look for 503B registration, third-party testing, and transparent pricing. Read verified patient reviews to find the best provider for your needs.