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Desmopressin Acetate Injection (Ferring)
DESCRIPTION
DESMOPRESSIN ACETATE Injection 4 µg/mL is a synthetic analogue of the natural pituitary hormone 8-arginine vasopressin (ADH), an antidiuretic hormone affecting renal water conservation. It is chemically defined as follows:
1-(3-mercaptopropionic acid)-8-D-arginine vasopressin monoacetate (salt) trihydrate.
DESMOPRESSIN ACETATE Injection 4 µg/mL is provided as a sterile, aqueous solution for injection.
Each mL provides:Desmopressin acetate4.0 µg
Sodium chloride9.0 mg
Hydrochloric acid to adjust pH to 4
The 10 mL vial contains chlorobutanol as a preservative (5.0 mg/mL).
CLINICAL PHARMACOLOGY
DESMOPRESSIN ACETATE Injection 4 µg/mL contains as active substance, desmopressin acetate, a synthetic analogue of the natural hormone arginine vasopressin. One mL (4 µg) of DESMOPRESSIN ACETATE solution has an antidiuretic activity of about 16 IU; 1 µg of DESMOPRESSIN ACETATE is equivalent to 4 IU.
DESMOPRESSIN ACETATE has been shown to be more potent than arginine vasopressin in increasing plasma levels of factor VIII activity in patients with hemophilia and von Willebrand's disease Type I.
Dose-response studies were performed in healthy persons, using doses of 0.1 to 0.4 µg/kg body weight, infused over a 10-minute period. Maximal dose response occurred at 0.3 to 0.4 µg/kg. The response to DESMOPRESSIN ACETATE of factor VIII activity and plasminogen activator is dose-related, with maximal plasma levels of 300 to 400 percent of initial concentrations obtained after infusion of 0.4 µg/kg body weight. The increase is rapid and evident within 30 minutes, reaching a maximum at a point ranging from 90 minutes to two hours. The factor VIII related antigen and ristocetin cofactor activity were also increased to a smaller degree, but still are dose-dependent.
- The biphasic half-lives of DESMOPRESSIN ACETATE were 7.8 and 75.5 minutes for the fast and slow phases, respectively, compared with 2.5 and 14.5 minutes for lysine vasopressin, another form of the hormone. As a result, DESMOPRESSIN ACETATE provides a prompt onset of antidiuretic action with a long duration after each administration.
- The change in structure of arginine vasopressin to DESMOPRESSIN ACETATE has resulted in a decreased vasopressor action and decreased actions on visceral smooth muscle relative to the enhanced antidiuretic activity, so that clinically effective antidiuretic doses are usually below threshold levels for effects on vascular or visceral smooth muscle.
- When administered by injection, DESMOPRESSIN ACETATE has an antidiuretic effect about ten times that of an equivalent dose administered intranasally.
- The bioavailability of the subcutaneous route of administration was determined qualitatively using urine output data. The exact fraction of drug absorbed by that route of administration has not been quantitatively determined.
- The percentage increase of factor VIII levels in patients with mild hemophilia A and von Willebrand's disease was not significantly different from that observed in normal healthy individuals when treated with 0.3 µg/kg of DESMOPRESSIN ACETATE infused over 10 minutes.
- Plasminogen activator activity increases rapidly after DESMOPRESSIN ACETATE infusion, but there has been no clinically significant fibrinolysis in patients treated with DESMOPRESSIN ACETATE.
- The effect of repeated DESMOPRESSIN ACETATE administration when doses were given every 12 to 24 hours has generally shown a gradual diminution of the factor VIII activity increase noted with a single dose. The initial response is reproducible in any particular patient if there are 2 or 3 days between administrations.
INDICATIONS AND USAGE
Hemophilia A: DESMOPRESSIN ACETATE Injection 4 µg/mL is indicated for patients with hemophilia A with factor VIII coagulant activity levels greater than 5%.
DESMOPRESSIN ACETATE will often maintain hemostasis in patients with hemophilia A during surgical procedures and postoperatively when administered 30 minutes prior to scheduled procedure.
DESMOPRESSIN ACETATE will also stop bleeding in hemophilia A patients with episodes of spontaneous or trauma-induced injuries such as hemarthroses, intramuscular hematomas or mucosal bleeding.
DESMOPRESSIN ACETATE is not indicated for the treatment of hemophilia A with factor VIII coagulant activity levels equal to or less than 5%, or for the treatment of hemophilia B, or in patients who have factor VIII antibodies.
In certain clinical situations, it may be justified to try DESMOPRESSIN ACETATE in patients with factor VIII levels between 2% to 5%; however, these patients should be carefully monitored.
von Willebrand's Disease (Type I): DESMOPRESSIN ACETATE Injection 4 µg/mL is indicated for patients with mild to moderate classic von Willebrand's disease (Type I) with factor VIII levels greater than 5%. DESMOPRESSIN ACETATE will often maintain hemostasis in patients with mild to moderate von Willebrand's disease during surgical procedures and postoperatively when administered 30 minutes prior to the scheduled procedure.
DESMOPRESSIN ACETATE will usually stop bleeding in mild to moderate von Willebrand's patients with episodes of spontaneous or trauma-induced injuries such as hemarthroses, intramuscular hematomas or mucosal bleeding.
Those von Willebrand's disease patients who are least likely to respond are those with severe homozygous von Willebrand's disease with factor VIII coagulant activity and factor VIII von Willebrand factor antigen levels less than 1%. Other patients may respond in a variable fashion depending on the type of molecular defect they have. Bleeding time and factor VIII coagulant activity, ristocetin cofactor activity, and von Willebrand factor antigen should be checked during administration of DESMOPRESSIN ACETATE to ensure that adequate levels are being achieved.
DESMOPRESSIN ACETATE is not indicated for the treatment of severe classic von Willebrand's disease (Type I) and when there is evidence of an abnormal molecular form of factor VIII antigen. (See WARNINGS .)
Diabetes Insipidus: DESMOPRESSIN ACETATE Injection 4 µg/mL is indicated as antidiuretic replacement therapy in the management of central (cranial) diabetes insipidus and for the management of the temporary polyuria and polydipsia following head trauma or surgery in the pituitary region. DESMOPRESSIN ACETATE is ineffective for the treatment of nephrogenic diabetes insipidus.
DESMOPRESSIN ACETATE is also available as an intranasal preparation. However, this means of delivery can be compromised by a variety of factors that can make nasal insufflation ineffective or inappropriate. These include poor intranasal absorption, nasal congestion and blockage, nasal discharge, atrophy of nasal mucosa, and severe atrophic rhinitis. Intranasal delivery may be inappropriate where there is an impaired level of consciousness. In addition, cranial surgical procedures, such as transsphenoidal hypophysectomy, create situations where an alternative route of administration is needed as in cases of nasal packing or recovery from surgery.
CONTRAINDICATIONS
DESMOPRESSIN ACETATE Injection 4 µg/mL is contraindicated in individuals with known hypersensitivity to desmopressin acetate or to any of the components of DESMOPRESSIN ACETATE Injection 4 µg/mL.
WARNINGS
Patients who do not have need of antidiuretic hormone for its antidiuretic effect, in particular those who are young or elderly, should be cautioned to ingest only enough fluid to satisfy thirst, in order to decrease the potential occurrence of water intoxication and hyponatremia.
Fluid intake should be adjusted downward, particularly in very young and elderly patients, in order to decrease the potential occurrence of water intoxication and hyponatremia.
Particular attention should be paid to the possibility of the rare occurrence of an extreme decrease in plasma osmolality that may result in seizures which could lead to coma.
DESMOPRESSIN ACETATE should not be used to treat patients with Type IIB von Willebrand's disease since platelet aggregation may be induced.
PRECAUTIONS
General: For injection use only.
DESMOPRESSIN ACETATE Injection 4 µg/mL has infrequently produced changes in blood pressure causing either a slight elevation in blood pressure or a transient fall in blood pressure and a compensatory increase in heart rate. The drug should be used with caution in patients with coronary artery insufficiency and/or hypertensive cardiovascular disease.
DESMOPRESSIN ACETATE should be used with caution in patients with conditions associated with fluid and electrolyte imbalance, such as cystic fibrosis, because these patients are prone to hyponatremia.
There have been rare reports of thrombotic events following DESMOPRESSIN ACETATE Injection 4 µg/mL in patients predisposed to thrombus formation. No causality has been determined, however, the drug should be used with caution in these patients.
Severe allergic reactions have been reported rarely. Fatal anaphylaxis has been reported in one patient who received intravenous DESMOPRESSIN ACETATE. It is not known whether antibodies to DESMOPRESSIN ACETATE Injection 4 µg/mL are produced after repeated injections.
Hemophilia A: Laboratory tests for assessing patient status include levels of factor VIII coagulant, factor VIII antigen and factor VIII ristocetin cofactor (von Willebrand factor) as well as activated partial thromboplastin time. Factor VIII coagulant activity should be determined before giving DESMOPRESSIN ACETATE for hemostasis. If factor VIII coagulant activity is present at less than 5% of normal, DESMOPRESSIN ACETATE should not be relied on.
von Willebrand's Disease: Laboratory tests for assessing patient status include levels of factor VIII coagulant activity, factor VIII ristocetin cofactor activity, and factor VIII von Willebrand factor antigen. The skin bleeding time may be helpful in following these patients.
Diabetes Insipidus: Laboratory tests for monitoring the patient include urine volume and osmolality. In some cases, plasma osmolality may be required.
Drug Interactions: Although the pressor activity of DESMOPRESSIN ACETATE is very low compared with the antidiuretic activity, use of doses as large as 0.3 µg/kg of DESMOPRESSIN ACETATE with other pressor agents should be done only with careful patient monitoring.
DESMOPRESSIN ACETATE has been used with epsilon aminocaproic acid without adverse effects.
Carcinogenicity, Mutagenicity, Impairment of Fertility: Studies with DESMOPRESSIN ACETATE have not been performed to evaluate carcinogenic potential, mutagenic potential or effects on fertility.
Pregnancy Category B: Fertility studies have not been done. Teratology studies in rats and rabbits at doses from 0.05 to 10 µg/kg/day (approximately 0.1 times the maximum systemic human exposure in rats and up to 38 times the maximum systemic human exposure in rabbits based on surface area, mg/m 2 ) revealed no harm to the fetus due to DESMOPRESSIN ACETATE. There are, however, no adequate and well controlled studies in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should be used during pregnancy only if clearly needed.
Several publications of desmopressin acetate's use in the management of diabetes insipidus during pregnancy are available; these include a few anecdotal reports of congenital anomalies and low birth weight babies. However, no causal connection between these events and desmopressin acetate has been established. A fifteen year, Swedish epidemiologic study of the use of desmopressin acetate in pregnant women with diabetes insipidus found the rate of birth defects to be no greater than that in the general population; however the statistical power of this study is low. As opposed to preparations containing natural hormones, desmopressin acetate in antidiuretic doses has no uterotonic action and the physician will have to weigh the therapeutic advantages against the possible risks in each case.
Nursing Mothers: There have been no controlled studies in nursing mothers. A single study in postpartum women demonstrated a marked change in plasma, but little if any change in assayable DESMOPRESSIN ACETATE in breast milk following an intranasal dose of 10 µg. It is not known whether this drug is excreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when DESMOPRESSIN ACETATE is administered to a nursing woman.
Pediatric Use: Use in infants and pediatric patients will require careful fluid intake restriction to prevent possible hyponatremia and water intoxication. DESMOPRESSIN ACETATE Injection 4 µg/mL should not be used in infants less than three months of age in the treatment of hemophilia A or von Willebrand's disease; safety and effectiveness in pediatric patients under 12 years of age with diabetes insipidus have not been established.
ADVERSE REACTIONS
Infrequently, DESMOPRESSIN ACETATE has produced transient headache, nausea, mild abdominal cramps and vulval pain. These symptoms disappeared with reduction in dosage. Occasionally, injection of DESMOPRESSIN ACETATE has produced local erythema, swelling or burning pain. Occasional facial flushing has been reported with the administration of DESMOPRESSIN ACETATE. DESMOPRESSIN ACETATE Injection has infrequently produced changes in blood pressure causing either a slight elevation or a transient fall and a compensatory increase in heart rate. Severe allergic reactions including anaphylaxis have been reported rarely with DESMOPRESSIN ACETATE Injection.
See WARNINGS for the possibility of water intoxication and hyponatremia.
There have been rare reports of thrombotic events (acute cerebrovascular thrombosis, acute myocardial infarction) following DESMOPRESSIN ACETATE Injection in patients predisposed to thrombus formation.
OVERDOSAGE
(See ADVERSE REACTIONS .) In case of overdosage, the dosage should be reduced, frequency of administration decreased, or the drug withdrawn according to the severity of the condition.
There is no known specific antidote for desmopressin acetate or DESMOPRESSIN ACETATE Injection 4 µg/mL.
An oral LD 50 has not been established. An intravenous dose of 2 mg/kg in mice demonstrated no effect.
DOSAGE AND ADMINISTRATION
Hemophilia A and von Willebrand's Disease (Type I): DESMOPRESSIN ACETATE Injection 4 µg/mL is administered as an intravenous infusion at a dose of 0.3 µg DESMOPRESSIN ACETATE/kg body weight diluted in sterile physiological saline and infused slowly over 15 to 30 minutes. In adults and children weighing more than 10 kg, 50 mL of diluent is recommended; in children weighing 10 kg or less, 10 mL of diluent is recommended. Blood pressure and pulse should be monitored during infusion. If DESMOPRESSIN ACETATE Injection 4 µg/mL is used preoperatively, it should be administered 30 minutes prior to the scheduled procedure.
The necessity for repeat administration of DESMOPRESSIN ACETATE or use of any blood products for hemostasis should be determined by laboratory response as well as the clinical condition of the patient. The tendency toward tachyphylaxis (lessening of response) with repeated administration given more frequently than every 48 hours should be considered in treating each patient.
Diabetes Insipidus: This formulation is administered subcutaneously or by direct intravenous injection. DESMOPRESSIN ACETATE Injection 4 µg/mL dosage must be determined for each patient and adjusted according to the pattern of response. Response should be estimated by two parameters: adequate duration of sleep and adequate, not excessive, water turnover.
The usual dosage range in adults is 0.5 mL (2.0 µg) to 1 mL (4.0 µg) daily, administered intravenously or subcutaneously, usually in two divided doses. The morning and evening doses should be separately adjusted for an adequate diurnal rhythm of water turnover. For patients who have been controlled on intranasal DESMOPRESSIN ACETATE and who must be switched to the injection form, either because of poor intranasal absorption or because of the need for surgery, the comparable antidiuretic dose of the injection is about one-tenth the intranasal dose.
Parenteral drug products should be inspected visually for particulate matter and discoloration prior to administration whenever solution and container permit.
HOW SUPPLIED
DESMOPRESSIN ACETATE Injection 4 µg/mL is available as a sterile solution in cartons of ten 1 mL single-dose ampules (NDC 55566-5030-1) and in 10 mL multiple-dose vials (NDC 55566-5040-1), each containing 4.0 µg DESMOPRESSIN ACETATE per mL.
Store refrigerated 2 to 8°C (36 to 46°F).
Rx only
Keep out of the reach of children.
Manufactured for
SUFFERN, NY 10901
By Ferring Pharmaceuticals, Limhamn, Sweden
Rev. 4/03 6018-02
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