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Drug acting on GI (Laxative (Opioid R. Anta (treat (Acute ,Chronic therapy…
Drug acting on GI
Laxative
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watery Evacuation ,1-3 hr.
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osmotically active agent
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Saline laxative
MgSO4 , Ma(OH)2 , Magnesium citrate ,Na3PO4
water retention ,sti peristalsis
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Opioid R. Anta
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treat
Acute ,Chronic therapy w/ Opioide
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selective Anta U opioid R., ไม่ผ่าน BBB SAFE
Emesis /Vomiting
สาเหต
Pregnancy , Toxin ,smell ,cerebral pressue , GI imflam,Rotation movemet
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กระตุ้น by
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Vestibular system <มี H1 R,M1 R>
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Chemoreceptor trigger zone รับสัญญาณจาก toxin ใน blood {D2 R,5-HT3}
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Gastrointestinaltract ,Heart
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classification
D2 R. Anta
drug
Phenothiazines ,Butyrophenones
Prochlorperazine, Promethazine ,droperidol
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H1 R anta
drug
Diphenhydramine,Dimenhydrinate
s/E
ง่วง ,Anticholinergic ปากแห้ง ง่วงมากๆๆๆ :<3:
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5-HT3 R Anta
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treat :check:
chemotherapy-induced nausea,vomiting :<3:
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Cannabinoids
Drug
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Nabilone
THC analog
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s/e drowsiness ,drymouth,psychotic react.
Prokinetic drug
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กลไก หลัก มี 4
D2 R anta.
drug
Metoclopramide
cross BBB :<3:
s/E EPS (act. in brain D2 ) ,หยุดยาหายได้
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Domperidone
Not cross BBB :<3:
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S/E รุนแรง QT prolongation ,arrhythmia,torsade de pointe
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5-HT4 R ago.
กลไก
sti. 5-HT4 R ที่ IPANs
enhance release Ach ,Calcitonin gene related peptide (CGRP)
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drug
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Tegaserod
ถูกถอนม , Cardiact evident รุนแรง
Cholinomimetic Agonist
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drug
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Neostifmine
sti M3 R on muscel cell,Myenteric plexus
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