To control chloe's nausea chloe's doctor gives her zofran which blocks the action of serotonin a chemical involved in the bodys nausea response

The medical which is prescribed by chloe's doctor as a/n Agonist.

Agonist is termed as the chemical which is bonded to a receptor whereby its work is to activate the receptor by producing biological response.

There are different types of agonists for example, receptor which is activated by exogenous or endogenous agonist which are neurotransmitter and hormones.

Other types of agonist are full agonists, selective agonist, superagonist and partial agonist.