Aminohippurate
Editor-In-Chief: C. Michael Gibson, M.S., M.D. [1]; Associate Editor(s)-in-Chief: Rabin Bista, M.B.B.S. [2]
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Overview
Aminohippurate is a Diagnostic Agent that is FDA approved for the diagnosis of effective renal plasma flow (ERPF). Common adverse reactions include Hypersensitivity reactions including anaphylaxis, angioedema, urticaria.
Adult Indications and Dosage
FDA-Labeled Indications and Dosage (Adult)
Indications
- Estimation of effective renal plasma flow.
- Measurement of the functional capacity of the renal tubular secretory mechanism.
Dosage
For intravenous use only
Clearance measurements using single injection techniques are generally inaccurate, particularly in the measurement of ERPF. For this reason, intravenous infusions at fixed rates are used to sustain the plasma PAH concentration at the desired level.
To measure ERPF, the concentration of PAH in the plasma should be maintained at 2 mg per 100 mL, which can be achieved with a priming dose of 6 to 10 mg/kg and an infusion dose of 10 to 24 mg/min.
As a research procedure for the measurement of TmPAH, the plasma level of PAH must be sufficient to saturate the capacity of the tubular secretory cells. Concentrations from 40 to 60 mg per 100 mL are usually necessary.
Technical details of these tests may be found in Smith {1}; Wesson {2}; Bauer {3}; Pitts{4}; and Schnurr {5}.
Parenteral drug products should be inspected visually for particulate matter and discoloration prior to use, whenever solution and container permit. NOTE: The normal color range for this product is a colorless to yellow/brown solution. The efficacy is not affected by color changes within this range.
Calculations Effective Renal Plasma Flow (ERPF)
The clearance of PAH, which is extracted almost completely from the plasma during its passage through the renal circulation, constitutes a measure of ERPF. Hence:
ERPF = UPAHV/PPAH
Where UPAH = concentration of PAH (mg/mL) in the urine
V = rate of urine excretion (mL/min), and
PPAH = plasma concentration of PAH (mg/mL).
Example:
UPAH = 8.0 mg/mL
V = 1.5 mL/min
PPAH = 0.02 mg/mL
ERPF = 8.0 x 1.5/0.02 = 600 mL/min
Based on PAH clearance studies, the normal values for ERPF are:
men 675 ± 150 mL/min
women 595 ± 125 mL/min
Maximum Tubular Secretory (TmPAH ) Mechanism
The quantity of PAH secreted by the tubules (TmPAH) is given by the difference between the total rate of excretion (UPAHV) and the quantity filtered by the glomeruli (GFR x PPAH). Hence:
TmPAH = UPAHV – (GFR x PPAH x 0.83)
The factor, 0.83, corrects for that portion of PAH which is bound to plasma protein and hence is unfilterable.
Example:
UPAH = 9.55 mg/mL
V = 16.68 mL/min
GFR = 120 mL/min
PPAH = 0.60 mg/mL
Then TmPAH = 9.55 x 16.68 – (120 x 0.60 x 0.83) = 100 mg/min.
Average normal values of TmPAH are 80-90 mg/min.
The value of the expression UPAHV, used in calculations of ERPF and TmPAH, may be found by determining the amount of PAH in a measured volume of urine excreted within a specific period of time.
These calculations are based on a body surface area of 1.73 m2. Corrections for variations in surface area are made by multiplying the values obtained for ERPF and TmPAH by 1.73/A, where A is the subject surface area.
Off-Label Use and Dosage (Adult)
Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Aminohippurate in adult patients.
Non–Guideline-Supported Use
There is limited information regarding Off-Label Non–Guideline-Supported Use of Aminohippurate in adult patients.
Pediatric Indications and Dosage
FDA-Labeled Indications and Dosage (Pediatric)
- Safety and effectiveness in pediatric patients have not been established.
Off-Label Use and Dosage (Pediatric)
Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Aminohippurate in pediatric patients.
Non–Guideline-Supported Use
There is limited information regarding Off-Label Non–Guideline-Supported Use of Aminohippurate in pediatric patients.
Contraindications
- Hypersensitivity to this product or to its components.
Warnings
Precautions
General Intravenous solutions must be given with caution to patients with low cardiac reserve, since a rapid increase in plasma volume can precipitate congestive heart failure.
For measurement of ERPF, small doses of PAH are used. However, in research procedures to measure TmPAH, high plasma levels are required to saturate the capacity of the tubular cells. During these procedures, the intravenous administration of PAH solutions should be carried out slowly and with caution. The patient should be continuously observed for any adverse reactions.
Use caution when injecting this product into latex-sensitive individuals, since the vial stopper contains dry natural latex rubber that may cause allergic reactions.
Adverse Reactions
Clinical Trials Experience
Hypersensitivity reactions including anaphylaxis, angioedema, urticaria, vasomotor disturbances, flushing, tingling, nausea, vomiting, and cramps may occur.
Patients may have a sensation of warmth or the desire to defecate or urinate during or shortly following initiation of infusion.
Postmarketing Experience
There is limited information regarding Postmarketing Experience of Aminohippurate in the drug label.
Body as a Whole
Cardiovascular
Digestive
Endocrine
Hematologic and Lymphatic
Metabolic and Nutritional
Musculoskeletal
Neurologic
Respiratory
Skin and Hypersensitivy Reactions
Special Senses
Urogenital
Miscellaneous
Drug Interactions
- Renal clearance measurements of PAH cannot be made with any significant accuracy in patients receiving sulfonamides, procaine, or thiazolesulfone. These compounds interfere with chemical color development essential to the analytical procedures.
Probenecid depresses tubular secretion of certain weak acids such as PAH. Therefore, patients receiving probenecid will have erroneously low ERPF and TmPAH values.
Use in Specific Populations
Pregnancy
- Animal reproduction studies have not been done with PAH. It is also not known whether PAH can cause fetal harm when given to a pregnant woman or can affect reproduction capacity. PAH should be given to a pregnant woman only if clearly needed.
- Australian Drug Evaluation Committee (ADEC) Pregnancy Category
There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of Aminohippurate in women who are pregnant.
Labor and Delivery
There is no FDA guidance on use of Aminohippurate during labor and delivery.
Nursing Mothers
- 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 PAH is administered to a nursing woman.
Pediatric Use
- Safety and effectiveness in pediatric patients have not been established.
Geriatic Use
- Clinical studies of PAH did not include sufficient numbers 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.
Gender
There is no FDA guidance on the use of Aminohippurate with respect to specific gender populations.
Race
There is no FDA guidance on the use of Aminohippurate with respect to specific racial populations.
Renal Impairment
There is no FDA guidance on the use of Aminohippurate in patients with renal impairment.
Hepatic Impairment
There is no FDA guidance on the use of Aminohippurate in patients with hepatic impairment.
Females of Reproductive Potential and Males
There is no FDA guidance on the use of Aminohippurate in women of reproductive potentials and males.
Immunocompromised Patients
There is no FDA guidance one the use of Aminohippurate in patients who are immunocompromised.
Administration and Monitoring
Administration
- Intravenous
Monitoring
There is limited information regarding Monitoring of Aminohippurate in the drug label.
IV Compatibility
There is limited information regarding IV Compatibility of Aminohippurate in the drug label.
Overdosage
- The intravenous LD50 in female mice is 7.22 g/kg.
Pharmacology
There is limited information regarding Aminohippurate Pharmacology in the drug label.
Mechanism of Action
Structure
- Aminohippurate sodium1 is an agent to measure effective renal plasma flow (ERPF). It is the sodium salt of para-aminohippuric acid, commonly abbreviated “PAH”. It is water soluble, lipid-insoluble, and has a pKa of 3.83. The empirical formula of the anhydrous salt is C9H9N2NaO3 and its structural formula is:
This image is provided by the National Library of Medicine.
It is provided as a sterile, non-preserved 20 percent aqueous solution for injection, with a pH of 6.7 to 7.6. Each 10 mL contains: Aminohippurate sodium 2 g. Inactive ingredients: Sodium hydroxide to adjust pH, water for injection, q.s.
Pharmacodynamics
There is limited information regarding Pharmacodynamics of Aminohippurate in the drug label.
Pharmacokinetics
PAH is filtered by the glomeruli and is actively secreted by the proximal tubules. At low plasma concentrations (1.0 to 2.0 mg/100 mL), an average of 90 percent of PAH is cleared by the kidneys from the renal blood stream in a single circulation. It is ideally suited for measurement of ERPF since it has a high clearance, is essentially nontoxic at the plasma concentrations reached with recommended doses, and its analytical determination is relatively simple and accurate.
PAH is also used to measure the functional capacity of the renal tubular secretory mechanism or transport maximum (TmPAH). This is accomplished by elevating the plasma concentration to levels (40-60 mg/100 mL) sufficient to saturate the maximal capacity of the tubular cells to secrete PAH.
Inulin clearance is generally measured during TmPAH determinations since glomerular filtration rate (GFR) must be known before calculations of secretory Tm measurements can be done
Nonclinical Toxicology
Carcinogenesis, Mutagenesis, Impairment of Fertility Long-term studies in animals have not been done to evaluate any effects upon fertility or carcinogenic potential of PAH.
Clinical Studies
There is limited information regarding Clinical Studies of Aminohippurate in the drug label.
How Supplied
- No. 95 — Aminohippurate Sodium, 20 percent sterile solution for intravenous injection, is supplied as follows:
NDC 0006-3395-11 in 10 mL vials.
Storage
- Store at 25°C (77°F); excursions permitted to 15-30°C (59-86°F)
Images
Drug Images
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Package and Label Display Panel
PRINCIPAL DISPLAY PANEL - CARTON - 10 ML SINGLE DOSE VIAL
This image is provided by the National Library of Medicine.
Ingredients and Appearance
This image is provided by the National Library of Medicine.
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Patient Counseling Information
There is limited information regarding Patient Counseling Information of Aminohippurate in the drug label.
Precautions with Alcohol
- Alcohol-Aminohippurate interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.
Brand Names
- AMINOHIPPURATE SODIUM PAH®[1]
Look-Alike Drug Names
There is limited information regarding Aminohippurate Look-Alike Drug Names in the drug label.
Drug Shortage Status
Price
References
The contents of this FDA label are provided by the National Library of Medicine.
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