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The antidiuretic property of diazoxide may lead to significant fluid retention, which in patients with compromised cardiac reserve, may precipitate congestive heart failure. The fluid retention will respond to conventional therapy with diuretics. It should be noted that concomitantly administered thiazides may potentiate the hyperglycemic and hyperuricemic actions of diazoxide (See DRUG INTERACTIONS and Animal Pharmacology and/or Toxicology).
Ketoacidosis and nonketotic hyperosmolar coma have been reported in patients treated with recommended doses of PROGLYCEM® (diazoxide capsules) usually during intercurrent illness. Prompt recognition and treatment are essential (See OVERDOSAGE), and prolonged surveillance following the acute episode is necessary because of the long drug half-life of approximately 30 hours. The occurrence of these serious events may be reduced by careful education of patients regarding the need for monitoring the urine for sugar and ketones and for prompt reporting of abnormal findings and unusual symptoms to the physician. Transient cataracts occurred in association with hyperosmolar coma in an infant, and subsided on correction of the hyper-osmolarity. Cataracts have been observed in several animals receiving daily doses of intravenous or oral diazoxide.
The development of abnormal facial features in four children treated chronically ( > 4 years) with PROGLYCEM® (diazoxide capsules) for hypoglycemia hyperinsulinism in the same clinic has been reported.
treatment with PROGLYCEM® (diazoxide capsules) should be initiated under close clinical supervision, with careful monitoring of blood glucose and clinical response until the patient's condition has stabilized. This usually requires several days. If not effective in two to three weeks, the drug should be discontinued.
Prolonged treatment requires regular monitoring of the urine for sugar and ketones, especially under stress conditions, with prompt reporting of any abnormalities to the physician. Additionally, blood sugar levels should be monitored periodically by the physician to determine the need for dose adjustment.
The effects of diazoxide on the hematopoietic system and the level of serum uric acid should be kept in mind; the latter should be considered particularly in patients with hyperuricemia or a history of gout.
In some patients, higher blood levels have been observed with the oral suspension than with the capsule formulation of PROGLYCEM® (diazoxide capsules) . Dosage should be adjusted as necessary in individual patients if changed from one formulation to the other. Since the plasma half-life of diazoxide is prolonged in patients with impaired renal function, a reduced dosage should be considered. Serum electrolyte levels should also be evaluated for such patients.
The antihypertensive effect of other drugs may be enhanced by PROGLYCEM® (diazoxide capsules) , and this should be kept in mind when administering it concomitantly with antihypertensive agents.
Because of the protein binding, administration of PROGLYCEM® (diazoxide capsules) with coumarin or its derivatives may require reduction in the dosage of the anticoagulant, although there has been no reported evidence of excessive anticoagulant effect. In addition,
The following procedures may be especially important in patient monitoring (not necessarily inclusive); blood glucose determinations (recommended at periodic intervals in patients taking diazoxide orally for treatment of hypoglycemia, until stabilized); blood urea nitrogen (BUN) determinations and creatinine clearance determinations; hematocrit determinations; platelet count determinations; total and differential leukocyte counts; serum aspartate aminotransferase (AST) level determinations; serum uric acid level determinations; and urine testing for glucose and ketones (in patients being treated with diazoxide for hypoglycemia, semiquantitative estimation of sugar and ketones in serum performed by the patient and reported to the physician provides frequent and relatively inexpensive monitoring of the condition).
Carcinogenesis, mutagenesis, impairment of fertility
No long-term animal dosing study has been done to evaluate the carcinogenic potential of diazoxide. No laboratory study of mutagenic potential or animal study of effects on fertility has been done.
Pregnancy Category C
Reproduction studies using the oral preparation in rats have revealed increased fetal resorptions and delayed parturition, as well as fetal skeletal anomalies; evidence of skeletal and cardiac teratogenic effects in rabbits has been noted with intravenous administration. The drug has also been demonstrated to cross the placental barrier in animals and to cause degeneration of the fetal pancreatic beta cells (See Animal Pharmacology and/or Toxicology). Since there are no adequate data on fetal effects of this drug when given to pregnant women, safety in pregnancy has not been established. When the use of PROGLYCEM® (diazoxide capsules) is considered, the indications should be limited to those specified above for adults (See INDICATIONS), and the potential benefits to the mother must be weighed against possible harmful effects to the fetus.
Diazoxide crosses the placental barrier and appears in cord blood. When given to the mother prior to delivery of the infant, the drug may produce fetal or neonatal hyperbilirubinemia, thrombocytopenia, altered carbohydrate metabolism, and possibly other side effects that have occurred in adults.
Alopecia and hypertrichosis lanuginosa have occurred in infants whose mothers received oral diazoxide during the last 19 to 60 days of pregnancy.
Labor and delivery
Since intravenous administration of the drug during labor may cause cessation of uterine contractions, and administration of oxytocic agents may be required to reinstate labor, caution is advised in administering PROGLYCEM® (diazoxide capsules) at that time.
Information is not available concerning the passage of diazoxide in breast milk. Because many drugs are excreted in human milk and because of the potential for adverse reactions from diazoxide in nursing infants, a decision should be made whether to discontinue nursing or to discontinue the drug, taking into account the importance of the drug to the mother.
Last reviewed on RxList: 2/13/2009
This monograph has been modified to include the generic and brand name in many instances.
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