HISTAMINES AND ANTI HISTAMINES

1. Cetirizine is a metabolite of

• Loratadine

• Levocetirizine

• Hydralazine

• Hydroxyzine

select most appropriate answer

Histamines are not active orally because

• rate of absorption is low

• liver degrades all histamine that is absorbed

  from the intestines

• histamines are not palatable

• histamines causes nausea

Examples of autocoids are all EXCEPT

• serotonin

• gastrin

• cortisol

• histamine

Second generation anti histamine in following is

• Fexofenadine

• Cinnaarizine

• Hydroxyzine

• Meclozine

Mechanism of action of Cyproheptadine

• Blocks 5HT2A and H1

• Blocks only 5HT2A

• Blocks only H1

• Block H2