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R-Gene
Overview
What is R-Gene?
Each 100 mL of R-Gene 10 (Arginine Hydrochloride Injection, USP) for intravenous use contains 10 g of L-Arginine Hydrochloride, USP in Water for Injection, USP (equivalent to a 10% solution). L-arginine is a naturally occurring amino acid.
R-Gene 10 is hypertonic (950 mOsmol/liter) and contains 47.5 mEq of chloride ion per 100 mL of solution. The pH is adjusted to 5.6 (5.0–6.5) with arginine base or hydrochloric acid.
What does R-Gene look like?
What are the available doses of R-Gene?
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What should I talk to my health care provider before I take R-Gene?
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How should I use R-Gene?
R-Gene 10 is indicated as an intravenous stimulant to the pituitary for the release of human growth hormone in patients where the measurement of pituitary reserve for HGH can be of diagnostic usefulness. It can be used as a diagnostic aid in such conditions as panhypopituitarism, pituitary dwarfism, chromophobe adenoma, postsurgical craniopharyngioma, hypophysectomy, pituitary trauma, acromegaly, gigantism and problems of growth and stature.
If the insulin hypoglycemia test has indicated a deficiency of pituitary reserve for HGH, a test with R-Gene 10 is advisable to confirm the negative response. This can be done after a waiting period of one day. As patients may not respond to R-Gene 10 (Arginine Hydrochloride Injection, USP) during the first test, the unresponsive patient should be tested again to confirm the negative result. A second test can be performed after a waiting period of one day. Some patients who respond to R-Gene 10 do not respond to insulin and vice versa. The rate of false positive responses for R-Gene 10 is approximately 32%, and the rate of false negatives is approximately 27%.
The recommended adult dose is 30 g arginine hydrochloride (300 mL of R-Gene 10) administered by intravenous infusion over 30 minutes. The total dose should not exceed 30 g arginine hydrochloride. See for preparation instructions.
What interacts with R-Gene?
The administration of R-Gene 10 is contraindicated in persons having known hypersensitivity to any ingredient in this product.
What are the warnings of R-Gene?
Since there have been rare spontaneous reports of thrombocytopenia from postmarketing experience, patients should be observed regularly for possible occurrence of thrombocytopenia.
There have been reports of overdosage of R-Gene 10 in pediatric patients leading to death. EXTREME CAUTION MUST BE EXERCISED WHEN INFUSING R-GENE 10 INTO PEDIATRIC PATIENTS. OVERDOSAGE OF R-GENE 10 IN PEDIATRIC PATIENTS CAN RESULT IN HYPERCHLOREMIC METABOLIC ACIDOSIS, CEREBRAL EDEMA, OR POSSIBLY DEATH.
Hypersensitivity reactions, including anaphylaxis have been reported. Appropriate medical support should be available during R-Gene 10 administration. If anaphylaxis or other serious hypersensitivity reaction occurs, R-Gene 10 should be discontinued and appropriate medical treatment initiated.
R-Gene 10 should always be administered by intravenous infusion because of its hypertonicity.
R-Gene 10 is a diagnostic aid and is not intended for therapeutic use.
What are the precautions of R-Gene?
General
R-Gene 10 is a hypertonic (950 mOsmol/liter) and acidic (average pH of 5.6) solution that can cause irritation and damage to tissues. Care should be used to ensure administration of R-Gene 10 through a patent catheter within a patent vein. Excessive rates of infusion may result in local irritation and in flushing, nausea, or vomiting. Inadequate dosing or prolongation of the infusion period may diminish the stimulus to the pituitary and nullify the test.
The arginine in R-Gene 10 can be metabolized resulting in nitrogen-containing products for excretion. The effect of an acute amino acid or nitrogen burden upon patients with impairment of renal function should be considered when R-Gene 10 is to be administered.
The chloride content of R-Gene 10 is 47.5 mEq per 100 mL of solution, and the effect of infusing this amount of chloride into patients with electrolyte imbalance should be evaluated before the test is undertaken.
It should be noted that the basal and post stimulation levels of growth hormone are elevated in patients who are pregnant or are taking oral contraceptives.
Carcinogenesis, mutagenesis, and impairment of fertility
Long term animal studies have not been performed to evaluate the carcinogenic potential, the mutagenic potential or the effect on fertility of intravenously administered R-Gene 10.
Pregnancy
Reproduction studies have been performed in rabbits and mice at doses 12 times the human dose and have revealed no evidence of impaired fertility or harm to the fetus due to R-Gene 10 (10% Arginine Hydrochloride Injection, USP). There have been no adequate or well controlled studies for the use of R-Gene 10 in pregnant women. Because animal reproduction studies are not always predictive of human response, this drug should not be used during pregnancy.
Nursing Mothers
It is not known whether intravenous administration of R-Gene 10 could result in significant quantities of arginine in breast milk. Systemically administered amino acids are secreted into breast milk in quantities not likely to have a deleterious effect on the infant. Nevertheless, caution should be exercised when R-Gene 10 is to be administered to nursing women.
Geriatric Use
Clinical studies of arginine did not include a sufficient number of subjects aged 65 and over to determine whether they respond differently from younger subjects. Other reported clinical experience has not identified differences in responses between the elderly and younger patients.
What are the side effects of R-Gene?
Adverse reactions associated with 1670 infusions in premarketing studies were as follows:
Non-specific side effects consisting of nausea, vomiting, headache, flushing, numbness and local venous irritation were reported in approximately 3% of the patients.
One patient had an allergic reaction which was manifested as a confluent macular rash with reddening and swelling of the hands and face. The rash subsided rapidly after the infusion was terminated and 50 mg of diphenhydramine were administered. One patient had an apparent decrease in platelet count from 150,000 to 60,000. One patient with a history of acrocyanosis had an exacerbation of this condition following infusion of R-Gene 10.
Post Marketing Experience
The following adverse events have been reported during post-marketing use: extravasation leading to burn-like reaction and/or skin necrosis requiring surgical intervention, hypersensitivity reactions including anaphylaxis, and hematuria that in some cases occurred 1–2 days after an R-Gene 10 administration. Because these adverse events are reported voluntarily from a population of uncertain size, it is not always possible to reliably estimate their frequency or establish a causal relationship to drug exposure.
What should I look out for while using R-Gene?
The administration of R-Gene 10 is contraindicated in persons having known hypersensitivity to any ingredient in this product.
There have been reports of overdosage of R-Gene 10 in pediatric patients leading to death. EXTREME CAUTION MUST BE EXERCISED WHEN INFUSING R-GENE 10 INTO PEDIATRIC PATIENTS. OVERDOSAGE OF R-GENE 10 IN PEDIATRIC PATIENTS CAN RESULT IN HYPERCHLOREMIC METABOLIC ACIDOSIS, CEREBRAL EDEMA, OR POSSIBLY DEATH.
Hypersensitivity reactions, including anaphylaxis have been reported. Appropriate medical support should be available during R-Gene 10 administration. If anaphylaxis or other serious hypersensitivity reaction occurs, R-Gene 10 should be discontinued and appropriate medical treatment initiated.
R-Gene 10 should always be administered by intravenous infusion because of its hypertonicity.
R-Gene 10 is a diagnostic aid and is not intended for therapeutic use.
What might happen if I take too much R-Gene?
An overdosage may cause a transient metabolic acidosis with hyperventilation, which could lead to death (see ""). In most cases the acidosis will self-compensate and the base deficit will return to normal following completion of the infusion. If the condition persists, the deficit should be determined and corrected by a calculated dose of an alkalizing agent.
How should I store and handle R-Gene?
R-Gene 10 is supplied as a 300 mL fill in 500 mL glass containers.Preservative Free: Discard any unused portion.NDCExposure of pharmaceutical products to heat should be minimized. Avoid excessive heat. It is recommended that the product be stored at room temperature (25°C); however, brief exposure up to 40°C does not adversely affect the product. Solution that has been frozen must not be used.R-Gene 10 is supplied as a 300 mL fill in 500 mL glass containers.Preservative Free: Discard any unused portion.NDCExposure of pharmaceutical products to heat should be minimized. Avoid excessive heat. It is recommended that the product be stored at room temperature (25°C); however, brief exposure up to 40°C does not adversely affect the product. Solution that has been frozen must not be used.R-Gene 10 is supplied as a 300 mL fill in 500 mL glass containers.Preservative Free: Discard any unused portion.NDCExposure of pharmaceutical products to heat should be minimized. Avoid excessive heat. It is recommended that the product be stored at room temperature (25°C); however, brief exposure up to 40°C does not adversely affect the product. Solution that has been frozen must not be used.R-Gene 10 is supplied as a 300 mL fill in 500 mL glass containers.Preservative Free: Discard any unused portion.NDCExposure of pharmaceutical products to heat should be minimized. Avoid excessive heat. It is recommended that the product be stored at room temperature (25°C); however, brief exposure up to 40°C does not adversely affect the product. Solution that has been frozen must not be used.
Clinical Information
Chemical Structure
No Image foundClinical Pharmacology
Intravenous infusion of R-Gene 10 often induces a pronounced rise in the plasma level of human growth hormone (HGH) in subjects with intact pituitary function. This rise is usually diminished or absent in patients with impairment of this function.
These ranges are based on the mean values of plasma HGH levels calculated from the data of several clinical investigators and reflect their experiences with various methods of radioimmunoassay. Upon gaining experience with this diagnostic test, each clinician will establish his/her own ranges for control and peak levels of HGH.
L-arginine is a normal metabolite in animals and man and has a low order of toxicity.
Non-Clinical Toxicology
The administration of R-Gene 10 is contraindicated in persons having known hypersensitivity to any ingredient in this product.There have been reports of overdosage of R-Gene 10 in pediatric patients leading to death. EXTREME CAUTION MUST BE EXERCISED WHEN INFUSING R-GENE 10 INTO PEDIATRIC PATIENTS. OVERDOSAGE OF R-GENE 10 IN PEDIATRIC PATIENTS CAN RESULT IN HYPERCHLOREMIC METABOLIC ACIDOSIS, CEREBRAL EDEMA, OR POSSIBLY DEATH.
Hypersensitivity reactions, including anaphylaxis have been reported. Appropriate medical support should be available during R-Gene 10 administration. If anaphylaxis or other serious hypersensitivity reaction occurs, R-Gene 10 should be discontinued and appropriate medical treatment initiated.
R-Gene 10 should always be administered by intravenous infusion because of its hypertonicity.
R-Gene 10 is a diagnostic aid and is not intended for therapeutic use.
Drugs with Ototoxic Potential (see )
Especially in the presence of impaired renal function, the use of parenterally administered bumetanide in patients to whom aminoglycoside antibiotics are also being given should be avoided, except in life-threatening conditions.
Drugs with Nephrotoxic Potential
There has been no experience with the concurrent use of bumetanide with drugs known to have a nephrotoxic potential. Therefore, the simultaneous administration of these drugs should be avoided.
Lithium
Lithium should generally not be given with diuretics (such as bumetanide) because they reduce its renal clearance and add a high risk of lithium toxicity.
Probenecid
Pretreatment with probenecid reduces both the natriuresis and hyperreninemia produced by bumetanide. This antagonistic effect of probenecid on bumetanide natriuresis is not due to a direct action on sodium excretion but is probably secondary to its inhibitory effect on renal tubular secretion of bumetanide. Thus, probenecid should not be administered concurrently with bumetanide.
Indomethacin
Indomethacin blunts the increases in urine volume and sodium excretion seen during bumetanide treatment and inhibits the bumetanide-induced increase in plasma renin activity. Concurrent therapy with bumetanide is thus not recommended.
Antihypertensives
Bumetanide may potentiate the effect of various antihypertensive drugs, necessitating a reduction in the dosage of these drugs.
Digoxin
Interaction studies in humans have shown no effect on digoxin blood levels. Anticoagulants Interaction studies in humans have shown bumetanide to have no effect on warfarin metabolism or on plasma prothrombin activity.
R-Gene 10 is a hypertonic (950 mOsmol/liter) and acidic (average pH of 5.6) solution that can cause irritation and damage to tissues. Care should be used to ensure administration of R-Gene 10 through a patent catheter within a patent vein. Excessive rates of infusion may result in local irritation and in flushing, nausea, or vomiting. Inadequate dosing or prolongation of the infusion period may diminish the stimulus to the pituitary and nullify the test.
The arginine in R-Gene 10 can be metabolized resulting in nitrogen-containing products for excretion. The effect of an acute amino acid or nitrogen burden upon patients with impairment of renal function should be considered when R-Gene 10 is to be administered.
The chloride content of R-Gene 10 is 47.5 mEq per 100 mL of solution, and the effect of infusing this amount of chloride into patients with electrolyte imbalance should be evaluated before the test is undertaken.
It should be noted that the basal and post stimulation levels of growth hormone are elevated in patients who are pregnant or are taking oral contraceptives.
Adverse reactions associated with 1670 infusions in premarketing studies were as follows:
Non-specific side effects consisting of nausea, vomiting, headache, flushing, numbness and local venous irritation were reported in approximately 3% of the patients.
One patient had an allergic reaction which was manifested as a confluent macular rash with reddening and swelling of the hands and face. The rash subsided rapidly after the infusion was terminated and 50 mg of diphenhydramine were administered. One patient had an apparent decrease in platelet count from 150,000 to 60,000. One patient with a history of acrocyanosis had an exacerbation of this condition following infusion of R-Gene 10.
Reference
This information is obtained from the National Institute of Health's Standard Packaging Label drug database.
"https://dailymed.nlm.nih.gov/dailymed/"
While we update our database periodically, we cannot guarantee it is always updated to the latest version.
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