Antihistamines
Categories:
- 1st Generation H1 receptor antagonists
- May antagonize muscarinic receptors leading to anticholinergic effects
- Decrease PNS = SNS effects
- Urinary retention, retention due to impaired detrusor contraction
- Azelastine (Astelin)
- May antagonize muscarinic receptors leading to anticholinergic effects
- 2nd Generation H1 receptor antagonists
- Fexofenadine (Allegra)
- Loratadine (Claritin)
- Desloratadine (Clarinex)
- Cetirizine (Zyrtec)
- SE: sedation, arrhythmias in overdose
- H2 receptor antagonists
- Cimetidine (Tagamet)
- Famotidine (Pepcid)
- Ranitidine (Zantac)