Clinical experience in acute overdosage of diphenidol.
BACKGROUND
Diphenidol (Cephadol, Vontrol), an antiemetic agent used in the treatment of vomiting and vertigo, has been reported to cause various adverse effects including drowsiness, hypotension, confusion, hallucination, restlessness, and other antimuscarinic effects. Serious toxic effects might be anticipated after intentional or accidental ingestion.


METHODS
Retrospective analysis of all case records of the PCC-Taiwan defining diphenidol overdose during 1985-1996.


RESULTS
The data of 21 patients with diphenidol overdose were analyzed; 17 were < 3 years old and unintentionally poisoned, in contrast to the suicide attempts by four adults. The average amount of ingestion was 222.5 mg with a range of 25-800 mg. Most patients manifested only transient CNS, cardiovascular, or oculo-facial effects, but four children suffered from severe toxicity after an ingestion of 11.7-80 mg/kg diphenidol. Commonly reported toxicity in diphenidol overdose included facial flush (10), tachycardia, restlessness (6), seizures (4), dyspnea, drowsiness, mydriasis, coma, and fever (3). With supportive therapy, a good recovery was the rule except for one fatality of a 2 1/2-year-old boy who ingested 15 mg/kg diphenidol and presented with recurrent seizures, hypotension, respiratory failure, and coma.


CONCLUSIONS
Although not previously reported, accidental diphenidol overdose may result in serious anticholinergic toxicity in children. Treatment is supportive and the therapeutic role of physostigmine in diphenidol poisoning is still unclear.
Yang
C C
CC
National Yang-Ming University, Taipei, Taiwan. ccyang@mail.vghtpe.gov.tw
Deng
J F
JF
D000328:Adult; D000368:Aged; D000932:Antiemetics / Q000506:poisoning*; D002675:Child, Preschool; D004305:Dose-Response Relationship, Drug; D062787:Drug Overdose; D005260:Female; D006801:Humans; D007223:Infant; D008297:Male; D008875:Middle Aged; D010880:Piperidines / Q000506:poisoning*; D011039:Poison Control Centers; D011041:Poisoning / Q000145:classification / Q000503:physiopathology / Q000628:therapy; D012189:Retrospective Studies; D012720:Severity of Illness Index; D016896:Treatment Outcome
D000932:Antiemetics; D010880:Piperidines; C004858:diphenidol