Inclusion Criteria

Patients must have a diagnosis of HIV-1 infection as defined by the Centers for Disease
Control.

All patients must have availability of a parent or legal guardian able and willing to give
informed consent and comply with the requirements of the study.

Post menarchal adolescent females must have a negative urine pregnancy test within 14 days
prior to initiation of study therapy and consent to urine pregnancy testing at every visit
for the remainder of the study. If sexually active, must also be willing to use a
barrier method of contraception or willing to remain sexually abstinent during the course
of the study.

Sexually active males must agree to practice barrier contraception for the duration of the
study.

Patients must have a plasma HIV-RNA viral load of greater than or equal to 10,000
copies/ml (4.0 log10) on 2 occasions at least 1 week apart at study entry.

Patients must be between the ages of 3 years to 21 years old and able to swallow capsules.

Patients must have an age-adjusted normal serum creatinine or a creatinine clearance
greater than or equal to 60 ml/min/1.73 m(2).

Patients must have an absolute granulocyte count greater than 1,500/mm(3), hemoglobin
greater than 8 gm/dL, and platelet count greater than 75,000/mm(3).

Patients must have an SGOT/SGPT/GGT less than 2.5 times normal unless considered to be
attributable to underlying HIV disease.

Patients must have a serum amylase less than 1.5 times the upper limit of normal. If
abnormal, a fractionated pancreatic amylase less than 45 U/L.

Immunomodulating agents such as corticosteroids for LIP, IVIG, erythropoietin, and anti-D
will be allowed.

Must not be critically ill or clinically unstable.

Must not have a history or a prior malignancy requiring active treatment within the last 2
years.

Must not have a prior history of hydroxyurea use.

Must not have the presence of an active infection requiring acute intervention at the time
of entry.

Patients receiving treatment for an infection that requires prolonged treatment must have
been stable on therapy for at least 7 days prior to study entry.

Prophylaxis for PCP as well as maintenance anti-mycobacterial therapy, antifungal, and
anti-viral therapy at the time of study will be allowed.

Must not currently use G-CSF or GM-CSF to maintain an adequate neutrophil count.

No evidence of active peripheral neuropathy.

No history of peripheral neuropathy of Grade III or greater severity associated with the
use of antiretroviral agents.

No patients with a previous history of pancreatitis attributed to ddI.

No previous history of pancreatitis requiring total parental nutrition within 2 years of
study enrollment.

Patients will be excluded if unable to tolerate antiretroviral therapy with stavudine,
didanosine or efavirenz due to allergic symptoms felt to be related to these
antiretroviral therapeutic agents.

Patients must not have a history of erythema multiforme or Stevens Johnson Syndrome
attributable to stauvudine, didanosine or nonnucleoside RTI.

No patients with multiple circumscribed active retinal lesions characterized by
alterations in retinal pigmentary epithelium consistent with didanosine toxicity.

No antiretroviral therapy within two weeks of study entry.