II. Causes: Anticholinergic Agents
- Tricyclic Antidepressants
- Antipsychotics
- Antiparkinsonian agents (Levodopa)
- Antihistamines
III. Causes: Cation-containing agents
- Aluminum: Antacids, Sucralfate
- Calcium: Antacids, supplements
- Bismuth
- Iron Supplements
IV. Causes: Miscellaneous
- Antidiarrheal overuse
- Calcium Channel Blockers (Nifedipine, Verapamil)
- Clonidine
- Diuretics
- Cholestyramine
- NSAIDs
- Opiates (see Narcotic Related Constipation)
- Vinca Alkaloids
- Sympathomimetic agents
- Ganglion blockers
V. References
- Cheskin in Barker (1995) Ambulatory Med, p. 476-81
- Friedman (1991) Medical Diagnosis, p. 192-4
- Borum (2001) Prim Care 28(3):577-90 [PubMed]
- Sadler (2022) Am Fam Physician 106(3): 299-306 [PubMed]
- Wald (2000) Med Clin North Am 84(5):1231-46 [PubMed]