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Type 2 diabetes mellitus and obesity are health conditions commonly managed with agents that modulate incretin signaling and appetite. Semaglutide is a long-acting glucagon-like peptide-1 (GLP-1) receptor agonist designed for once-weekly subcutaneous administration. It improves glycemic control and promotes weight loss in suitable patients.

What Semaglutide is

Semaglutide is a synthetic peptide analog of human GLP-1 with high receptor affinity. It activates the GLP-1 receptor to enhance glucose-dependent insulin secretion and delay gastric emptying. The pharmacokinetic profile supports once-weekly dosing at therapeutic concentrations. The product is supplied in prefilled subcutaneous pens for patient use or clinical administration.

What it is used for

Indications include adults with type 2 diabetes to improve glycemic control when used with diet and exercise, with or without other antidiabetic agents. It also serves adults with obesity or overweight who have at least one weight-related condition to promote weight loss when combined with a reduced-calorie diet and physical activity. Therapy should be tailored to the individual and continued alongside lifestyle measures.

Contraindications and precautions

Absolute contraindications include hypersensitivity to semaglutide or any excipients. Do not use in patients with a personal or family history of medullary thyroid carcinoma or with MEN2. Pregnancy and lactation are contraindications; data in pregnancy are limited. In patients with a history of pancreatitis or known risk factors for pancreatopathy, use with caution and monitor for signs of pancreatitis; discontinue if suspected. Gallbladder disease, including cholelithiasis or cholecystitis, has been observed; reassess if biliary symptoms occur. Severe gastrointestinal disease that may predispose to dehydration warrants cautious use and monitoring of hydration status. Hypoglycemia risk increases when semaglutide is used with insulin or sulfonylureas; adjust concomitant agents as needed. In older adults or those with significant comorbidity, monitor tolerability and adherence; thyroid safety should be considered in patients with thyroid disease, though a causal human link to thyroid malignancy has not been established. Regular reassessment of ongoing therapy is advised as weight or glycemic response changes.

Side effects by frequency

Very common (>10%) adverse events include nausea and vomiting, often dose-related and transient, and decreased appetite. Common (1–10%) events are diarrhea, constipation, abdominal pain, dyspepsia, injection-site reactions, headache, and fatigue. Uncommon (0.1–1%) events include pancreatitis, gallbladder disease, dehydration, dizziness, and tachycardia. Rare (<0.1%) events encompass severe hypersensitivity reactions such as anaphylaxis and thyroid C‑cell neoplasia reported in animals; human relevance remains uncertain. Hypoglycemia may occur when used with insulin or a sulfonylurea, necessitating adjustments in those regimens. GI adverse effects commonly improve with continued therapy or dose escalation.

Interactions with other substances

Concomitant use with insulin or sulfonylureas increases hypoglycemia risk; dose adjustments of these agents may be required. Concurrent oral medications may have altered absorption due to delayed gastric emptying; administer other drugs at least 1 hour before or 2 hours after semaglutide when feasible. Do not combine with other GLP-1 receptor agonists. No clinically significant interactions with warfarin are typically observed; monitor anticoagulation as indicated. Consider potential changes in hydration status and GI motility when initiating therapy or adjusting dose, particularly in patients with comorbid GI disease.