Presented is the first reported case of an anaphylactoid reaction following Norplant contraceptive implant insertion. The 19-year-old UK woman denied any history of allergic reaction to local anesthesia. After subcutaneous infiltration with 50 mg of 1% lidocaine (without adrenalin), 6 Norplant capsules were inserted through use of the standard insertion technique. Shortly after completion of the procedure, the patient collapsed and had 2 short convulsions. Her blood pressure dropped to 80/40 mm Hg and her radial pulse was 60 beats/minute and thready. Recovery was rapid following administration of intramuscular adrenalin and intravenous hydrocortisone. The woman later recalled a similar episode during a visit to her dentist. An estimated 3 in every 100,000 patients receiving lignocaine hydrochloride have an episode of anaphylaxis in the hospital. In type I hypersensitivity reactions, there is often a history of previous exposure to the allergen, as occurred in this patient. Those undertaking Norplant insertion and removal should be aware of the potential for serious allergic reactions and have access to resuscitative equipment.