Merck Sharp & Dohme Ltd has discontinued Tryptizol (amitriptyline) 10, 25 and 50mg tablets and Decadron Shock-Pak (dexamethasone 20mg/ml in 5ml vial) from its product range in the UK and the Republic of Ireland. The company says that this decision is a result of its regular assessment of all its products. n Smithkline Beecham has discontinued Dyazide tablets (hydrochlorothiazide 25mg, triamterene 50mg) pack size 500, due to a decrease in demand.