Inclusion Criteria

Concurrent Medication:

Allowed:

• Routine trimethoprim / sulfamethoxazole (TMP / SMX) (or whatever medications are considered appropriate by the patient's primary physician for medical management) 1 - 2 hours after pentamidine is given.

Patients must have:

• HIV infection with suspected Pneumocystis carinii pneumonia (PCP).
• Parent(s) or legal guardian must sign an informed consent.

Exclusion Criteria

Co-existing Condition:

Patients with the following conditions or symptoms are excluded:

• Known history of reactive airway disease or another chronic lung disease.
• Known previous adverse reaction to pentamidine.
• Thrombocytopenia.

Patients with the following are excluded:

• History of reactive airway disease or another chronic lung disease.
• Known previous adverse reaction to pentamidine.

Unable to cooperate with administration of aerosol via face mask.