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Acthrel
Overview
What is Acthrel?
ACTHREL (corticorelin ovine triflutate for injection) is a sterile, nonpyrogenic, lyophilized white cake powder, containing corticorelin ovine triflutate, a trifluoroacetate salt of a synthetic peptide that is used for the determination of pituitary corticotroph responsiveness. Corticorelin ovine has an amino acid sequence identical to ovine corticotropin-releasing hormone (oCRH). Corticorelin ovine is an analogue of the naturally occurring human CRH (hCRH) peptide. Both peptides are potent stimulators of adrenocorticotropic hormone (ACTH) release from the anterior pituitary. ACTH stimulates cortisol production from the adrenal cortex. The structural formula for corticorelin ovine triflutate is described below:
Ser-Gin-Glu-Pro-Pro-Ile-Ser-Leu-Asp-Leu-Thr-Phe-His-Leu-Leu-Arg-Glu-Val-Leu-Glu-Met-Thr-Lys-Ala-Asp-Gin-Leu-Ala-Gln-Gln-Ala-His-Ser-Asn-Arg-Lys-Leu-Leu-Asp-Ile-Ala-NH∙xCFCOOH
whereas =4 - 8.
The empirical formula of corticorelin ovine is CHNOS with a molecular weight of 4670.35 Daltons.
ACTHREL for injection is available in vials containing 100 mcg corticorelin ovine (as the trifluoroacetate), 0.88 mg ascorbic acid, 10 mg lactose, and 26 mg cysteine hydrochloride monohydrate. Trace amounts of chloride ion may be present from the manufacturing process. The preparation is intended for intravenous administration.
What does Acthrel look like?
What are the available doses of Acthrel?
Sorry No records found.
What should I talk to my health care provider before I take Acthrel?
Sorry No records found
How should I use Acthrel?
ACTHREL® is indicated for use in differentiating pituitary and ectopic production of ACTH in patients with ACTH-dependent Cushing's syndrome.
A single intravenous dose of ACTHREL at 1 mcg/kg is recommended for the testing of pituitary corticotrophin function. A dose of 1 mcg/kg is the lowest dose that produces maximal cortisol responses and significant (though apparently sub-maximal) ACTH responses. Doses above 1 mcg/kg are not recommended (see and ).
At a dose of 1 mcg/kg, the ACTH and cortisol responses to ACTHREL are prolonged and remain elevated for up to 2 hours. The maximum increment in plasma ACTH occurs between 15 and 60 minutes after ACTHREL administration, whereas the maximum increment in plasma cortisol occurs between 30 and 120 minutes. In a clinical study of 30 normal healthy men, the peak plasma ACTH and cortisol responses to ACTHREL administration in the early afternoon occurred at 42 ± 29 minutes and 65 ± 26 minutes (average ±SD), respectively
What interacts with Acthrel?
ACTHREL is contraindicated in patients with a history of a hypersensitivity reaction to ovine corticorelin or any of its excipients.
What are the warnings of Acthrel?
Sorry No Records found
What are the precautions of Acthrel?
General
The severity of adverse effects to a corticorelin injection appear to be dose-dependent. Dosages above 1 mcg/kg are not recommended. While few adverse effects have been observed at the 1 mcg/kg or 100 mcg dose, higher doses have been associated with transient tachycardia, decreased blood pressure, loss of consciousness, and asystole (see ). These symptoms can be substantially reduced by administering the drug as a 30-second intravenous infusion instead of a bolus injection. At a dose of 200 mcg corticorelin, 4 of 60 volunteers and patients with disturbances of the hypothalamic-pituitary-adrenal (HPA) axis were reported to have had decreased blood pressures. One patient had a severe hypotensive reaction with asystole. Three other patients had an "absence-like" loss of consciousness lasting approximately 5 minutes. In subsequent investigations by the same researchers over a 3-year period using 100 mcg of corticorelin, one patient in approximately 150 to 200 experienced a severe drop in blood pressure and loss of sinus rhythm after receiving 55 mcg of corticorelin, which may have been due to interaction with heparin (see ).
Hypersensitivity
Hypersensitivity reactions have been reported in patients receiving ACTHREL. Reactions included urticaria, flushing of the face, neck and upper chest; dyspnea, wheezing, urticaria and angioedema involving tongue, lip and facial swelling (see ). Should a hypersensitivity reaction occur, discontinue ACTHREL, monitor and treat if indicated.
Drug Interactions
The plasma ACTH response to corticorelin injection is inhibited or blunted in normal subjects pretreated with dexamethasone. The use of a heparin solution to maintain i.v. cannula patency during the corticorelin test is not recommended. A possible interaction between corticorelin and heparin may have been responsible for a major hypotensive reaction that occurred after corticorelin administration (see ).
Carcinogenesis, Mutagenesis, Impairment of Fertility
Animal studies have not been conducted with corticorelin to evaluate carcinogenic potential, mutagenicity, or effect on fertility.
Pregnancy
Animal reproduction studies have not been conducted with corticorelin. It is also not known whether corticorelin can cause fetal harm when administered to a pregnant woman or can affect reproductive capacity. ACTHREL should be given to a pregnant woman only if clearly needed.
Nursing Mothers
It is not known whether corticorelin is secreted in human milk. Because many drugs are excreted in human milk, caution should be exercised when ACTHREL is administered to a nursing woman.
PEDIATRIC USE
Only a few tests have been performed on children. Dosages were 1 mcg/kg body weight. Patient studies have involved only children with multiple hypothalamic and/or pituitary hormone deficiencies, or tumors. Only two studies with normal pediatric subjects have been conducted. No differences in response to the corticorelin test have been reported in the children studied.
What are the side effects of Acthrel?
Hypersensitivity reactions have been reported with 1 mcg/kg or 100 mcg/patient and include flushing of the face, neck, and upper chest; dyspnea, wheezing, urticaria, and angioedema (involving tongue, lip and facial swelling). Subjects have also reported an urge to take a deep breath, which occurs with a timing similar to, but less frequently than, that of flushing. Higher doses (>3 mcg/kg) are associated with more prolonged flushing, tachycardia, hypotension, dyspnea, and "chest compression" or tightness. In addition, at doses of >5 mcg/kg, significant increases in heart rate and decreases in blood pressure were observed. The cardiovascular effects occurred 2-3 minutes after injection and lasted for 30-60 minutes. The facial flushing was more prolonged, lasting up to 4 hours in some subjects. All signs and symptoms could be reduced by administering the drug as a 30-second infusion instead of by bolus injection.
Total doses of up to 200 mcg of corticorelin were administered as a bolus injection to 60 men and women, including both healthy normal subjects and patients with endocrine disorders. In most cases, only minor adverse effects, such as transient flushing and feelings of dyspnea, were noted. However, a few patients with disorders of the pituitary-adrenal axis had major symptoms. One patient had a precipitous fall in blood pressure and pulse rate and developed asystole, which required resuscitation. In two patients with Cushing's disease and in one with secondary adrenal insufficiency, an "absence-like" loss of consciousness occurred, which started within a few seconds after injection of corticorelin and lasted from 10 seconds to 5 minutes. This was accompanied by a slight fall in blood pressure. One patient with a well documented seizure diathesis experienced a grand mal epileptic seizure following ACTHREL administration. The patient had discontinued anti-convulsant therapy the day of the procedure (see ).
What should I look out for while using Acthrel?
ACTHREL is contraindicated in patients with a history of a hypersensitivity reaction to ovine corticorelin or any of its excipients.
What might happen if I take too much Acthrel?
Symptoms of overdose include severe facial flushing, cardiovascular changes, and dyspnea. In the event of toxic overdose (see ), adverse effects should be treated symptomatically.
How should I store and handle Acthrel?
HICON should be stored between 2°C and 25°C (36°F and 77°F). Store and dispose of HICON in compliance with the appropriate regulations of the government agency authorized to license the use of this radionuclide.Discard unused capsules after all HICON solution has been dispensed or expired. New blister packages of hard gelatin capsules are provided with each new shipment of HICON.This radiopharmaceutical is approved for use by persons under license by the Nuclear Regulatory Commission or the relevant regulatory authority of an Agreement State.HICON should be stored between 2°C and 25°C (36°F and 77°F). Store and dispose of HICON in compliance with the appropriate regulations of the government agency authorized to license the use of this radionuclide.Discard unused capsules after all HICON solution has been dispensed or expired. New blister packages of hard gelatin capsules are provided with each new shipment of HICON.This radiopharmaceutical is approved for use by persons under license by the Nuclear Regulatory Commission or the relevant regulatory authority of an Agreement State.HICON should be stored between 2°C and 25°C (36°F and 77°F). Store and dispose of HICON in compliance with the appropriate regulations of the government agency authorized to license the use of this radionuclide.Discard unused capsules after all HICON solution has been dispensed or expired. New blister packages of hard gelatin capsules are provided with each new shipment of HICON.This radiopharmaceutical is approved for use by persons under license by the Nuclear Regulatory Commission or the relevant regulatory authority of an Agreement State.ACTHREL is supplied as a sterile, nonpyrogenic, lyophilized, white cake containing 100 mcg corticorelin ovine (as the trifluoroacetate), 0.88 mg ascorbic acid, 10 mg lactose, and 26 mg cysteine hydrochloride monohydrate. Trace amounts of chloride ion may be present from the manufacturing process. The package provides a single-dose, rubber-capped, 5 mL, brown-glass vial (NDC 55566-0302-1) containing 100 mcg corticorelin ovine (as the trifluoroacetate). ACTHREL is stable in the lyophilized form when stored refrigerated at 2°C to 8°C (36°F to 46°F) and protected from light. The reconstituted solution is stable up to 8 hours under refrigerated conditions. Discard unused reconstituted solution.
Clinical Information
Chemical Structure
No Image foundClinical Pharmacology
In normal subjects, intravenous administration of corticorelin results in a rapid and sustained increase of plasma ACTH levels and a near parallel increase of plasma cortisol. In addition, intravenous administration of corticorelin to normal subjects causes a concomitant and prolonged release of the related proopiomelanocortin peptides β- and γ-lipotropins (β -and γ-LPH) and β-endorphin (β -END). A number of dose-response studies have been performed on normal subjects using a range of corticorelin doses. In one study, doses of corticorelin ranging from 0.001 to 30 mcg/kg body weight were administered to 29 healthy volunteers. Blood samples were taken over a 2-hour period for determination of plasma ACTH and cortisol concentrations. There was a direct dose-dependent relationship that was more pronounced for ACTH than for cortisol. The threshold dose was 0.03 mcg/kg, the half-maximal dose was 0.3-1.0 mcg/kg and the maximally effective dose was 3-10 mcg/kg.
Plasma ACTH levels in normal subjects increased 2 minutes after injection of corticorelin doses of ≥0.3 mcg/kg and reached peak levels after 10-15 minutes. Plasma cortisol levels increased within 10 minutes and reached peak levels at 30 to 60 minutes. As the dose of corticorelin was increased, the rises in plasma ACTH and cortisol were more sustained, showing a biphasic response with a second lower peak at 2-3 hours after injection. Similar results were found in another study using 0.3, 3.0, and 30 mcg/kg doses. The duration of mean plasma ACTH increase after injection of 0.3, 3.0, and 30 mcg/kg was 4, 7, and 8 hours, respectively. The effect on plasma cortisol was similar, but more prolonged. Because there are differences in basal levels and peak response levels following a.m. or p.m. administration, it is recommended that subsequent evaluations in the same patient using the corticorelin stimulation test be carried out at the same time of day as the original evaluation.
Baseline ACTH and cortisol levels are usually higher in the morning. Pooled ACTH values from normal unstressed subjects (n=119) were 25 ± 7 pg/mL in the a.m. and 10 ± 3 in the p.m.; similar pooled cortisol values (n=170) were 11 ± 3 mcg/dL in the a.m. and 4 ± 2 mcg/dL in the p.m. The normal unstressed person has about seven to ten secretory episodes of ACTH each day. Most of them occur in the early morning hours and are responsible for the morning plasma cortisol surge. The following figure shows the daily circadian rhythm of ACTH and cortisol secretions in a normal unstressed person. Insulin, plasma renin activity, prolactin, and growth hormone release are not affected by corticorelin administration in humans.
Continuous 24-hour infusion of corticorelin (0.5, 1.0, and 3.0 mcg/kg/hr) increased plasma ACTH concentrations to a plateau of 15-20 pg/mL by the third hour and urinary-free cortisol reaches 173 ± 43 mcg/dL by 24 hours, comparable to those levels observed in patients with major depression, but less than levels noted in Cushing's disease. Continuous infusion did not abolish the circadian rhythm of plasma ACTH and cortisol, but did appear to desensitize the corticotroph. Intermittent doses of corticorelin (25 mcg every 4 hours for 72 hours), however, continued to elicit the expected ACTH and cortisol responses.
Intravenous administration of 1 mcg/kg corticorelin in combination with 10 pressor units intramuscular vasopressin had a synergistic effect on ACTH and a less marked synergistic effect on cortisol secretion.
The basal and peak response levels of ACTH and cortisol to a 1 mcg/kg or 100 mcg dose of corticorelin administered to normal volunteers in the morning and the evening are given below. These values were obtained by combining the results from 9 clinical trials conducted in the a.m. and 4 clinical trials conducted in the p.m.
The following table is to be used only as a general guide.
Non-Clinical Toxicology
ACTHREL is contraindicated in patients with a history of a hypersensitivity reaction to ovine corticorelin or any of its excipients.The plasma ACTH response to corticorelin injection is inhibited or blunted in normal subjects pretreated with dexamethasone. The use of a heparin solution to maintain i.v. cannula patency during the corticorelin test is not recommended. A possible interaction between corticorelin and heparin may have been responsible for a major hypotensive reaction that occurred after corticorelin administration (see ).
The severity of adverse effects to a corticorelin injection appear to be dose-dependent. Dosages above 1 mcg/kg are not recommended. While few adverse effects have been observed at the 1 mcg/kg or 100 mcg dose, higher doses have been associated with transient tachycardia, decreased blood pressure, loss of consciousness, and asystole (see ). These symptoms can be substantially reduced by administering the drug as a 30-second intravenous infusion instead of a bolus injection. At a dose of 200 mcg corticorelin, 4 of 60 volunteers and patients with disturbances of the hypothalamic-pituitary-adrenal (HPA) axis were reported to have had decreased blood pressures. One patient had a severe hypotensive reaction with asystole. Three other patients had an "absence-like" loss of consciousness lasting approximately 5 minutes. In subsequent investigations by the same researchers over a 3-year period using 100 mcg of corticorelin, one patient in approximately 150 to 200 experienced a severe drop in blood pressure and loss of sinus rhythm after receiving 55 mcg of corticorelin, which may have been due to interaction with heparin (see ).
Hypersensitivity reactions have been reported with 1 mcg/kg or 100 mcg/patient and include flushing of the face, neck, and upper chest; dyspnea, wheezing, urticaria, and angioedema (involving tongue, lip and facial swelling). Subjects have also reported an urge to take a deep breath, which occurs with a timing similar to, but less frequently than, that of flushing. Higher doses (>3 mcg/kg) are associated with more prolonged flushing, tachycardia, hypotension, dyspnea, and "chest compression" or tightness. In addition, at doses of >5 mcg/kg, significant increases in heart rate and decreases in blood pressure were observed. The cardiovascular effects occurred 2-3 minutes after injection and lasted for 30-60 minutes. The facial flushing was more prolonged, lasting up to 4 hours in some subjects. All signs and symptoms could be reduced by administering the drug as a 30-second infusion instead of by bolus injection.
Total doses of up to 200 mcg of corticorelin were administered as a bolus injection to 60 men and women, including both healthy normal subjects and patients with endocrine disorders. In most cases, only minor adverse effects, such as transient flushing and feelings of dyspnea, were noted. However, a few patients with disorders of the pituitary-adrenal axis had major symptoms. One patient had a precipitous fall in blood pressure and pulse rate and developed asystole, which required resuscitation. In two patients with Cushing's disease and in one with secondary adrenal insufficiency, an "absence-like" loss of consciousness occurred, which started within a few seconds after injection of corticorelin and lasted from 10 seconds to 5 minutes. This was accompanied by a slight fall in blood pressure. One patient with a well documented seizure diathesis experienced a grand mal epileptic seizure following ACTHREL administration. The patient had discontinued anti-convulsant therapy the day of the procedure (see ).
Reference
This information is obtained from the National Institute of Health's Standard Packaging Label drug database.
"https://dailymed.nlm.nih.gov/dailymed/"
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