Ozempic (semaglutide) is a prescription injection that's used along with a nutritious diet and exercise to treat Type 2 diabetes in adults. It's also proven to lower the risk of heart attack, stroke, and death due to heart problems in adults with Type 2 diabetes and heart disease. Ozempic (semaglutide) belongs to the drug class known as GLP-1 agonists. The dosing is convenient because it's only injected under the skin once per week. Common side effects of this medication include nausea, vomiting, and diarrhea.