Veronal is a barbiturate drug used as a......

The treatment of diseases using chemicals is called .......

Which one of the following is used as an antihistamine?

Barbiturates are hypnotic agents. Veronal is a derivative of barbituric acid. It can be synthesized by the following sequence,then the structure of veronal $(P)$ is :
$CH_2(CO_2Et)_2$ $\xrightarrow[EtI]{EtO^-}$ $\xrightarrow[EtI]{EtO^-}$ $\xrightarrow{Urea}$ $(P)$

What is a drug that promotes the excretion of urine called?

Why do we require artificial sweetening agents?