Table 2.

Summary of antagonists with concentration range and references

Drug	Receptor	Concentration range (µM)	Reference number
Ketanserin	5-HT2	1, 10, 100	56, 57
Ondansetron	5-HT3	1, 10, 100	58, 59
GR 113808	5-HT4	1, 10, 100	60–62