Anaphylaxis to Intravenous Co-amoxiclav

Patient B-217 is a 65-year-old female, weight 70 kg, admitted with community-acquired pneumonia. She has no known drug allergies and her regular medicines are atorvastatin 20 mg once daily and metformin 500 mg twice daily. She has normal renal function (creatinine 0.9 mg/dL, eGFR 80 mL/min/1.73m2). Thirty minutes ago she received her first intravenous dose of co-amoxiclav. She now complains of feeling light-headed and itchy. On examination: skin has widespread urticarial wheals; she is wheezy throughout both lung fields; blood pressure 78/40 mmHg; heart rate 132 bpm; respiratory rate 28/min; SpO2 88% on room air; temperature 36.8°C. Airway is patent, she is alert but distressed. You are the foundation doctor called to the patient. Prescribe the immediate management for anaphylaxis in this patient. Include drug doses, routes, and subsequent medications you would give. Also state what you would record and what would be prescribed before discharge.