50 • Fits or seizures • Swelling of the face, mouth or throat (angioneurotic oedema) • Purple or reddish-purple bumps on the skin (lichen planus), serious skin rashes (erythema multiforme), hives • Joint swelling, muscular weakness • Infection around the brain which may give severe headache with stiff neck and sensitivity to light (meningitis) • Inflammation of some blood vessels (vasculitis) • Serious allergic reactions (anaphylaxis, anaphylactoid reactions and mimicking serum sickness).