Managing Side Effects in the First Month

Most people experience some side effects when starting a GLP-1 medication. The good news: side effects are usually mild, temporary, and manageable. Most people find that side effects improve dramatically after the first 4-6 weeks as their body adjusts. Understanding what to expect and how to manage it can make the experience much easier.

Understanding the Timeline

Side effects typically peak in the first 2 weeks and improve substantially by week 4-6. Each time you increase your dose, side effects may briefly return for 1-2 days before improving again. This pattern is reassuring: if you tolerate the initial period, you will likely tolerate the entire treatment course.

Managing Nausea

Nausea is the most common side effect, affecting 40-50% of people. It is usually mild and most noticeable on injection day. Here is how to manage it:

• Take your injection in the evening so any nausea happens while you sleep
• Eat smaller, frequent meals rather than three large ones
• Avoid fatty, greasy, or spicy foods which trigger nausea
• Avoid strong smells in the kitchen that make nausea worse
• Eat bland foods: crackers, toast, plain chicken, rice, vegetables
• Drink water constantly throughout the day, not just with meals
• Try ginger tea, ginger sweets, or ginger supplements (ginger is proven to reduce nausea)
• Avoid alcohol and caffeine which worsen nausea
• Keep the room cool—overheating makes nausea worse
• Try motion sickness bands (acupressure wristbands) if nausea is significant

Managing Constipation and Diarrhoea

Some people become constipated on GLP-1 medication (Mounjaro is more common), while others develop loose stools or diarrhoea (more common with Wegovy). Both are manageable:

• Drink vastly more water than you normally would. Most constipation is caused by dehydration.
• Eat fibre-rich foods: vegetables, whole grains, beans, fruits
• For constipation: try a mild stool softener or fibre supplement if increasing water and diet does not help
• For diarrhoea: reduce fibre temporarily and avoid greasy foods until it resolves
• Exercise regularly—even a 20-minute walk aids digestion
• Establish a regular toilet routine—go to the bathroom at the same time each day

Managing Appetite Loss and Eating Enough

Some people feel so full that eating becomes difficult. Paradoxically, you still need adequate nutrition. Make this easier by eating nutrient-dense foods that require less volume: protein-rich foods (chicken, fish, eggs), full-fat dairy (which is calorie-dense), nuts and seeds, and healthy oils. This allows you to get adequate calories even if you are eating much less than before.

Other Common Side Effects

Fatigue and headaches can occur in the first week or two. These usually improve rapidly. Make sure you are drinking enough water and eating enough calories. Dizziness sometimes happens if your blood sugar drops (more likely if you have diabetes). Eat a small snack if dizzy. Taste changes are reported by some people—foods might taste different or metallic. This usually resolves quickly.

When Should You Contact Your Pharmacist?

Contact your prescribing pharmacist if: nausea is so severe you cannot eat or drink anything, you are unable to keep food down for more than a day, you experience severe abdominal pain, you have signs of pancreatitis (severe upper abdominal pain, vomiting), or side effects are not improving after 2 weeks. These are rare but need medical attention.

Practical Tips for Success

Keep a food diary and note which foods trigger side effects. This helps you identify patterns. Stay hydrated obsessively—this alone solves many side effect problems. Be patient: most people say that after 4-6 weeks, side effects are minimal and worth the weight loss and hunger reduction. If side effects are truly intolerable, you can stop the medication. But most people find that pushing through the first few weeks is worth it.

The Good News

Side effects get better. Significantly better. By week 4, most people report that nausea is gone or minimal. By week 8, most people have adapted completely and side effects are barely noticeable. The dramatic improvement in appetite and eating behaviour far outweighs the temporary discomfort of the first few weeks.