Extended-release nifedipine bezoar identified one year after discontinuation.
OBJECTIVE
To report a case of tablet impaction of nifedipine extended-release tablets (Procardia XL) discovered one year after discontinuation of the drug in a patient with peptic stricture.


METHODS
English-language references identified via a MEDLINE search from 1966 through September 1998 and bibliographic review of pertinent articles.


RESULTS
Extended-release nifedipine has been associated with the formation of medication bezoars in case reports. Bezoars are concretions of undigested material within the gastrointestinal (GI) tract. Although they can occur throughout the GI tract, bezoars are most frequently located in the stomach and, rarely, in the duodenum. We report an unusual case of tablet impaction with a gastric outlet obstruction in the duodenal area discovered one year after the patient stopped taking extended-release nifedipine.


CONCLUSIONS
Extended-release nifedipine is associated with tablet impaction, even long after discontinuing administration. Although rare, clinicians should be aware of this potential problem when prescribing extended-release medications to patients at risk, and should consider this possible etiology when refractory epigastric pain and weight loss occur.
College of Pharmacy, University of Florida, Gainesville, USA.
L M
LM
Niezabitowski
B N
BN
Nguyen
J G
JG
Gums
D000368:Aged; D001630:Bezoars / Q000150:complications / Q000175:diagnosis* / Q000601:surgery; D003692:Delayed-Action Preparations; D004380:Duodenal Obstruction / Q000209:etiology; D004386:Duodenum / Q000601:surgery; D016145:Endoscopy, Digestive System; D005260:Female; D006801:Humans; D009543:Nifedipine / Q000008:administration & dosage / Q000009:adverse effects*; D012307:Risk Factors; D013997:Time Factors
D003692:Delayed-Action Preparations; D009543:Nifedipine