The cheapest 300 mg strength allopurinol tablets available on the Irish market are Allopurinol tablets from Cox which have an ingredient cost of IR£8.46 for 100 tablets. On a pro rata basis this is an ingredient cost of IR£2.37 for 28 tablets. There are two different brands of Allopurinal 300 mg tablets in a 28 pack size on the Irish market. Caplenal tablets have an ingredient cost of £5.89 and Zyloric tablets have an ingredient cost of £8.95. While a tariff price, flat rate, system for non-branded generic drugs operates in the UK, I understand that the UK ingredient cost of Caplenal tablets 300 mg in a 28 pack size is £3.55 sterling and the ingredient cost of Zyloric 300 mg in a 28 pack size is £7.86 sterling.