Single-dose pharmacokinetics of enteric-coated didanosine in HIV-infected children

Jennifer R. King, Sharon Nachman, Ram Yogev, Janice Hodge, Grace Aldrovandi, Bharat Damle, Elizabeth Smith, Andrew Wiznia, Edward P. Acosta*

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations


Didanosine remains a cornerstone nucleoside analogue for the treatment of HIV infection. A potential problem with the buffered formulations of didanosine is the likelihood of interactions with other drugs that require an acidic pH for absorption or can be chelated by cations in the buffer. An encapsulated enteric-coated (EC) bead formulation of didanosine has been approved and is routinely used as an alternative to the chewable/dispersible buffered tablet formulation. The objective of this study was to evaluate the single-dose pharmacokinetics of didanosine EC at 240 mg/m2 in 10 HIV-infected children. Didanosine EC was administered at time 0 on an empty stomach with no other concomitant medications. Blood samples were collected at pre-dose, 0.5, 1, 2, 4, 8 and 12 h post-dose. Didanosine was measured in plasma using radioimmunoassay. Ten subjects completed the intensive pharmacokinetic evaluation; data are available for eight participants. Plasma concentrations of didanosine following EC administration were analysed using non-compartmental methods. Median (range) AUC∞, Cmax, Tmax and CL/F for didanosine following EC administration were 2385 (1291, 3966) ngxh/ml, 854 (300, 1799) ng/ml, 3.0 (1.0, 8.1) h and 3.3 (2.7-6.4) l/h/kg, respectively. Results from this study indicate that the didanosine Cmax is decreased and Tmax is prolonged, but total exposure of didanosine in plasma following didanosine EC administration appears similar to previous data collected in HIV-infected children following buffered didanosine administration.

Original languageEnglish (US)
Pages (from-to)267-270
Number of pages4
JournalAntiviral Therapy
Issue number4
StatePublished - Dec 2002

ASJC Scopus subject areas

  • Pharmacology
  • Pharmacology (medical)
  • Infectious Diseases


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