ChEBI

Any minor or unwanted substance introduced into the environment that can have undesired effects.

A molecular entity capable of accepting a hydron from a donor (Bronsted acid).

H2-receptor antagonists are the drugs that selectively bind to but do not activate histamine H2 receptors, thereby blocking the actions of endogenous histamine.

Any drug which causes the onset of an allergic reaction.

A xenobiotic (Greek, xenos "foreign"; bios "life") is a compound that is foreign to a living organism. Principal xenobiotics include: drugs, carcinogens and various compounds that have been introduced into the environment by artificial means.

H2-receptor antagonists are the drugs that selectively bind to but do not activate histamine H2 receptors, thereby blocking the actions of endogenous histamine.

One of various classes of drugs with different action mechanisms used to treat or ameliorate peptic ulcer or irritation of the gastrointestinal tract.

Any drug which causes the onset of an allergic reaction.