Side Effects and Risks of Slimming Injections and Advice Before Using Them Serious Side Effects and Risks of Slimming Injections The use of slimming injections may be associated with rare but serious side effects. These include: Severe allergic reactions, the most important symptoms of which are swelling of the face, lips, tongue, or throat; difficulty breathing or swallowing; dizziness or fainting; and skin rash. Pancreatitis, symptoms of which include nausea, vomiting, severe pain in the upper abdomen that may radiate to the back, and an increased heart rate. Gallbladder problems, where the patient should consult a doctor immediately if they experience symptoms such as fever, heartburn, or pain in the upper abdomen that may radiate to the back. Al-Mustaqbal University, the leading university in Iraq