GSK launched Zantac in 1981 and it was first approved for sale in the US in 1983 as a prescription medication. It went on to become the world's best-selling drug, with annual sales in excess of $1bn.

Zantac, initially developed by GSK and Warner-Lambert, entered the US market as a prescription drug in 1983 ... where a judge is considering the strength of scientific evidence in these cases ...