What are preanesthetics?

They are used to calm the pt, relieve pain and block side effects of admin anesthetics or procedure itself They include H2 blockers (Famotidine and Ranitidine - reduce gastric acidity) Benzodiazepines (Midazepam and diazepam - reduce anxiety facilitate amnesia) Non opioids (acetaminophen) and Opioid (Fentanyl) as anelgisics. Antihistamines (diphenhydramine - block allergic rxns) Antiemetics (odanestion) Anticholinergics (block bradycardia and secretion of fluids into respiratory tract)