<p>Hypersensitive reactions may occur after the injection of any serum of animal origin. In rare cases hypotension, dyspnoea, urticaria may occur. It should be treated with adrenalin, possibly in association with antihistamine and corticosteroid therapy. Serum sickness may occur 7 to 10 days after injection of serum of animal origin; symptoms include fever, vomiting, diarrhoea, bronchospasm and urticaria.</p>