The most common side effects with INCRELEX (seen in more than 1 patient in 10) are hypoglycaemia (low blood sugar levels), thymus hypertrophy (growth of the thymus gland, a gland below the breastbone that is involved in producing infection-fighting cells), headache, hypoacusis (hearing loss), tonsillar hypertrophy (growth of the tonsils), snoring and injection site hypertrophy (lumps at the site of injection).