Fisons plc was a British multinational pharmaceutical, scientific instruments and horticultural chemicals company headquartered in Ipswich, United Kingdom.

[7] Many years of successful growth were financed by sales of sodium cromoglycate in a variety of formulations used to treat asthma and allergies of the eye among several disease areas.

However, the loss of lucrative product licences for Opticrom and Imferon in the US in 1991[8] and the failure of clinical trials for Tipredane, an asthma drug, in 1993 revealed bleak prospects for the business.

[10] In late 1995 Fisons was acquired by the United States–based Rhone-Poulenc Rorer, Inc., which in turn was wholly owned by France's chemical giant Rhône-Poulenc S.A.[11] The company was based in Ipswich with Pharmaceutical Research and Development in Loughborough, United Kingdom, and Rochester, New York, US, and manufacturing in Holmes Chapel, Cheshire.

[12] The company's fertiliser factory in Ipswich, built in 1858, was Grade II listed; it was destroyed in a fire, suspected to be caused by arson, in 2019.