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Obesity, once primarily seen as the result of lifestyle choices, is now recognized as a chronic disease. Since 1975 the global prevalence of obesity has tripled; by 2025 it is estimated that about 18% of men and 21% of women worldwide will be affected. Obesity is defined as an excessive accumulation of body fat that can harm health and is commonly measured using the Body Mass Index (BMI). A BMI of 30 or higher generally indicates obesity, although there are exceptions (for example, athletes with high muscle mass).

Health Risks and Contributing Factors
Obesity increases the risk of serious conditions, including coronary heart disease, type 2 diabetes, osteoarthritis and other joint problems. Some contributing factors — such as genetics or a sedentary occupation — are difficult to change, while others — such as diet, physical activity and mental health — can often be improved with support.

The Pharmacist’s Role
Pharmacists are accessible healthcare professionals who can:

• Provide evidence-based advice on lifestyle changes (diet, exercise, smoking cessation).
• Review current medications to identify drugs that may contribute to weight gain and discuss alternatives with prescribers when appropriate.
• Counsel patients about prescription weight management medications, including how they work, expected benefits, common side effects, and safety monitoring.
• Reinforce adherence to prescribed treatment plans and advise when to consult the prescriber for follow-up or concerns.

Prescription Weight Management Medications
Several medications may be prescribed for weight management in appropriate patients. These should only be used under physician supervision and with pharmacist counseling:

• Orlistat (eg, Xenical): Reduces intestinal fat absorption; recommended alongside a reduced-calorie diet. Counsel patients about gastrointestinal side effects and the need for fat-soluble vitamin supplementation when used long term.
• Liraglutide (eg, Saxenda): A GLP-1 receptor agonist given by subcutaneous injection; slows gastric emptying and increases satiety. Monitor for gastrointestinal side effects and follow contraindications and dose-titration guidance.
• Semaglutide (eg, Wegovy) and other GLP-1 receptor agonists: Injectable therapies that reduce appetite and support weight loss when combined with lifestyle changes. Provide injection technique training and counseling on potential side effects.
• Tirzepatide (eg, Zepbound): A dual GIP/GLP-1 receptor agonist primarily for type 2 diabetes but used for weight management in selected patients; monitor blood glucose and gastrointestinal tolerance.
• Naltrexone/Bupropion (eg, Mysimba): An oral combination that affects central appetite regulation; discuss contraindications (eg, uncontrolled hypertension, seizure risk) and drug interactions.

Safety and Access

• Prescription medications for weight management must be initiated and monitored by a qualified prescriber. Pharmacists should verify the indication and ensure patients understand dosing, administration, potential adverse effects, and when to seek medical attention.
• Patients should not purchase prescription medicines from unverified online sources. Pharmacists can help patients identify legitimate, regulated pharmacies and advise on safe ordering and delivery practices for prescription medications.
• Some therapies require regular follow-up (weight checks, blood tests, blood pressure monitoring). Pharmacists can support adherence and coordinate care with prescribers.

Practical Steps for Patients

• Set realistic, individualized goals in collaboration with your healthcare team.
• Track food intake and activity to identify patterns and opportunities for improvement.
• Increase daily activity with achievable options (walking, cycling, household activities).
• Aim for sustainable lifestyle changes rather than rapid weight-loss strategies.
• Seek behavioral support, such as counseling, group programs or structured coaching, when appropriate.

Lifestyle Recommendations

• Healthy diet: Emphasize vegetables, fruits, whole grains, lean proteins and healthy fats. Limit highly processed foods, added sugars and excessive saturated fats.
• Regular physical activity: Strive for at least 150 minutes per week of moderate-intensity activity, or as advised by your healthcare provider.
• Behavioral approaches: Use mindful eating, social support, and motivational strategies to maintain changes.
• Avoid crash diets and unproven supplements that may be ineffective or harmful.

When to Consult a Healthcare Professional

• If you are considering prescription weight-management medication.
• If you have rapid weight changes, unexplained symptoms, or new/worsening medical conditions.
• If you have concerns about medication side effects or interactions.

Concluding Note
By combining evidence-based lifestyle changes with appropriate medical therapies and pharmacist support, patients can work toward sustainable weight management and improved overall health. If you have questions about medications or services, consult your pharmacist or prescriber for personalized advice.