A 24-year-old Indian female arrived in emergency department with complaints of acute swelling of the lower lip [Table/ Fig-1] with ulceration [Table/ Fig-2], causing pain and discomfort. She gave a history of loose stools and vomiting for two days, for which she was prescribed tablet Ofloxacin 200mg twice daily along with advice to take plenty of oral fluids, by a local general practitioner. The patient took one tablet of Ofloxacin and the frequency of the loose stools gradually decreased, but within few hours of ingestion of the antibiotic, she developed swelling of her lower lip which was increasing in its size along with discomfort and pain. There was no history of breathing difficulty, rashes and itching. Her examination showed normal vitals: pulse rate 74bpm, Blood pressure 120/70mmHg, chest bilaterally clear and normal cardiac rhythms. Her complete haemogram, renal and liver function tests were normal. She didn't have any known past history of allergic reaction to medicine or food, or history of any allergic condition like dermatitis or asthma. Considering the given history (with no history of any other medicine intake), clinical examination and the normal laboratory findings, an empirical diagnosis of Ofloxacin induced hypersensitivity (angioedema) was made and the patient was advised to stop the offending drug-Ofloxacin. Naranjo's causality assessment scale graded the reaction as 'probable'.She was given intravenous Methylprednisolone 40mg stat, Pheniramine maleate (Avil) 25mg intravenous stat and advised tablet Levocetirizine 10mg once daily for five days. After achieving symptomatic relief she was asked to follow-up in outpatient department. The patient showed recovery and the swelling and pain, reduced the next day. A written and informed consent was obtained from the patient for using the clinical images and the details of the case. The Adverse Drug Reaction (ADR) to a commonly prescribed anti-microbial can pose a major public health problem. The authors report a rare case of 24-year-old young lady who presented with angioedema of lips after ingestion of Ofloxacin, prescribed to her for treatment of loose motions. Fluoroquinolones are widely prescribed antibiotics for various disease conditions. The history, clinical examination and normal laboratory parameters led to the diagnosis of ofloxacin induced hypersensitivity reaction and the patient was successfully treated with corticosteroids and antihistamines. The hypersensitivity reactions to fluoroquinolones are rare with an incidence of 0.4% to 2%. The pharmacovigilance program and self-reporting of all the ADR's by the health care workers can help in ensuring the judicious use of the drug, drug safety and thus decrease the associated morbidity and mortality.