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Mercaptamine 0.55% eye drops

Mercaptamine is a medicine that stops build up of an amino acid called cystine in the body. Large amounts of cystine can build up in the body causing damage to tissues and organs when a child has a condition called cystinosis. Mercaptamine eye drops are prescribed to reduce build up of cystine crystals in the eyes.

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Pharmacy is defined as the study of medicines. It involves studying how medicines are discovered, developed and made. It also covers how medicines work in the body to prevent or treat disease, and how active ingredients can be made in to medicines.

Sturge-Weber syndrome

A syndrome is a collection of signs that are often seen together. Sturge-Weber syndrome (SWS) is a condition affecting the skin, brain and eyes. It is named after the doctors who described it in the late 19th century and early 20th century.

Nasopharyngeal airway (NPA)

The purpose of this guideline is to provide guidance about nasopharyngeal airways (NPA) at Great Ormond Street Hospital.

NOTE: We review our guidelines regularly and this guideline is now past its review date. The content of the guideline below may not reflect the most recent evidence based practice. Please use with caution.


Glomerulonephritis is the term used when the glomeruli become inflamed. This means that the blood is less able to pass through the blood vessels in the glomerulus and so the kidneys cannot make as much urine as usual.


A haemangioma is the most common type of birthmark. It is a benign (non-cancerous) tumour of the cells, called endothelial cells, which normally line the blood vessels. In haemangiomas, the endothelial cells multiply at an abnormally rapid rate. This collection of small blood vessels forms a lump in or under the skin.