Calcium Disodium Versenate Dosage
Generic name: EDETATE CALCIUM DISODIUM 200mg in 1mL
Dosage form: injection
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When a source for the lead intoxication has been identified, the patient should be removed from the source, if possible. The recommended dose of Calcium Disodium Versenate for asymptomatic adults and pediatric patients whose blood lead level is < 70 mcg/dl but > 20 mcg/dl (World Health Organization recommended upper allowable level) is 1000 mg/m2/day whether given intravenously or intramuscularly. (See Surface Area Nomogram.)
For adults with lead nephropathy, the following dosing regimen has been suggested: 500 mg/m2 every 24 hours for 5 days for patients with serum creatinine levels of 2–3 mg/dl, every 48 hours for 3 doses for patients with creatinine levels of 3–4 mg/dl, and once weekly for patients with creatinine levels above 4 mg/dl. These regimens may be repeated at one month intervals.12
Calcium Disodium Versenate, used alone, may aggravate symptoms in patients with very high blood lead levels. When the blood lead level is > 70 mcg/dl or clinical symptoms consistent with lead poisoning are present, it is recommended that Calcium Disodium Versenate be used in conjunction with BAL (dimercaprol). Please consult published protocols and specialized references for dosage recommendations of combination therapy.14–18
Therapy of lead poisoning in adults and pediatric patients with Calcium Disodium Versenate is continued over a period of five days. Therapy is then interrupted for 2 to 4 days to allow redistribution of the lead and to prevent severe depletion of zinc and other essential metals. Two courses of treatment are usually employed; however, it depends on severity of the lead toxicity and the patient's tolerance of the drug.
Calcium Disodium Versenate is equally effective whether administered intravenously or intramuscularly. The intramuscular route is used for all patients with overt lead encephalopathy and this route is preferred by some for young pediatric patients.
Acutely ill individuals may be dehydrated from vomiting. Since edetate calcium disodium is excreted almost exclusively in the urine, it is very important to establish urine flow with intravenous fluid administration before the first dose of the chelating agent is given; however, excessive fluid must be avoided in patients with encephalopathy. Once urine flow is established, further intravenous fluid is restricted to basal water and electrolyte requirements. Administration of Calcium Disodium Versenate should be stopped whenever there is cessation of urine flow in order to avoid unduly high tissue levels of the drug. Edetate calcium disodium must be used in reduced doses in patients with pre-existing mild renal disease.
Add the total daily dose of Calcium Disodium Versenate (1000 mg/m2/day) to 250–500 ml of 5% dextrose or 0.9% sodium chloride injection. The total daily dose should be infused over a period of 8–12 hours. Calcium Disodium Versenate injection is incompatible with 10% dextrose, 10% invert sugar in 0.9% sodium chloride, lactate Ringer's, Ringer's, one-sixth molar sodium lactate injections, and with injectable amphotericin B and hydralazine hydrochloride.
The total daily dosage (1000 mg/m2/day) should be divided into equal doses spaced 8–12 hours apart. Lidocaine or procaine should be added to the Calcium Disodium Versenate injection to minimize pain at the injection site. The final lidocaine or procaine concentration of 5 mg/ml (0.5%) can be obtained as follows: 0.25 ml of 10% lidocaine solution per 5 ml concentrated Calcium Disodium Versenate; 1 ml of 1% lidocaine or procaine solution per ml of concentrated Calcium Disodium Versenate. When used alone, regardless of method of administration, Calcium Disodium Versenate should not be given at doses larger than those recommended.
Several methods have been described for lead mobilization tests using edetate calcium disodium to assess body stores.7, 9,12,13,18
These procedures have advantages and disadvantages that should be reviewed in current references. Edetate calcium disodium mobilization tests should not be performed in symptomatic patients and in patients with blood lead levels above 55 mcg/dl for whom appropriate therapy is indicated.
Parenteral drugs should be inspected visually for particulate matter and discoloration prior to administration, whenever solution and container permit.