Gentamicin 40 mg/mL Injection, Solution — NDC 63323-010-94 (Billing 63323-0010-94)
This is a package of Gentamicin 40 mg/mL Injection, Solution from Fresenius Kabi USA, LLC, marketed since Aug 2000 and currently FDA-listed; retail pharmacies pay about $1.30 per mL (NADAC).
NDC database record
One package, one record: these facts belong to NDC 63323-010-94 alone.
- Record
- FDA NDC Directory package listing · Human prescription drug
- Code segments
- 63323 labeler · 010 product · 94 package
- Package marketed since
- Aug 10, 2000
- Sample package
- No — commercial package
- Listing certified through
- Dec 31, 2026
- Barcode (UPC-A, from the NDC)
- 3 6332301094 2
- Medicaid fills, this package
- 944 prescriptions in the last four reported quarters
- FDA record last changed
- Oct 8, 2026
Identity & classification
Regulatory identifiers FDA, NLM and CMS codes for this package
Drug-database identifiers Medi-Span GPI and First Databank GCN / HICL / AHFS classification
- GSN (GCN sequence number): 009299
- GCN: 41132
- GPI-14 (Medi-Span): 07000020102045
- HICL (First Databank): 004032
- AHFS class code: 08:12.02.00
- RxCUI (RxNorm): 313996
Where does this data come from?
- FDA openFDA NDC Directory · synced Oct 8, 2026
- FDA label on DailyMed · label index refreshed Oct 6, 2026
- RxNorm (NLM RxNav) · catalog refreshed Oct 1, 2026
- Medi-Span GPI (licensed)
- First Databank (licensed) · refreshed Oct 8, 2026
RxNorm drug class
This medicine belongs to the Aminoglycoside Antibacterial class.
Where does this data come from?
- RxClass (NLM) · catalog refreshed Oct 1, 2026
Clinical
Gentamicin injection is used to treat certain serious infections that are caused by bacteria. Gentamicin injection is in a class of medications called aminoglycoside antibiotics. It works by killing bacteria. Antibiotics such as gentamicin injection will not work for colds, flu, or other viral infections. Taking antibiotics when they are not needed increases your risk of getting an infection later that resists antibiotic treatment.
Read the full MedlinePlus article ↗- Gentamicin is reserved for serious or complicated bacterial infections — the kind that need a stronger, faster-acting antibiotic than a typical pill can provide. It's given by inje...
- Why am I getting gentamicin instead of a regular oral antibiotic?
- The two biggest things to watch for are changes in your hearing and changes in how much you're urinating. If you notice ringing or roaring in your ears, dizziness, or any hearing l...
- What side effects should I watch out for while I'm on this medication?
Patient education
Supplement & herbal interactions
Gentamicin (IV) may be associated with lower levels of 8 nutrients — worth a chat with your pharmacist, not a cause for alarm.
Where does this data come from?
- MedlinePlus (NLM) · refreshed Oct 1, 2026
- FDA label on DailyMed · label index refreshed Oct 6, 2026
Ask a licensed pharmacist directly — free, answered by our team.
Pricing
A drug doesn't have one price. Each row is a different public payment system, and none is what you'd pay at the counter — that depends on your insurance. The ⓘ on each row explains what it measures.
| Price system | Per mL | Per package |
|---|---|---|
| Retail pharmacies payNADAC · weekly | $1.303 | $65.13 / 50 ml |
| Medicaid paysCMS SDUD · 12 mo | $3.06 | $152.77 / 50 ml |
| Medicare drug plans payPart D · quarterly | No Part D plan price is available for this NDC in our data. | |
| Medicare Part B allowsASP · J1580 | $1.925 / J1580 unit | — |
Where does this data come from?
- CMS NADAC weekly file · file of Oct 7, 2026
- CMS ASP pricing files · refreshed Sep 20, 2026
- CMS Medicaid State Drug Utilization Data · through Q1 2026
- CMS Part D plan pricing files · refreshed Sep 24, 2026
- VA National Acquisition Center price file
Billing & reimbursement
Where does this data come from?
- CMS ASP NDC-HCPCS crosswalk · refreshed Sep 22, 2026
- DMEPDAC NDC-HCPCS crosswalk
- openFDA NSDE billing units · refreshed Oct 7, 2026
Packaging — all sizes for this product
| Package NDC | Description | Per unit | Per pack | Marketing start | Marketing end | Status |
|---|---|---|---|---|---|---|
| 63323-0010-02 63323-010-02 Main listing | 25 VIAL in 1 TRAY / 2 mL in 1 VIAL | $1.30 / mL | $65.13 | 2000-08-10 | — | Active |
| 63323-0010-20 63323-010-20 | 25 VIAL in 1 TRAY / 20 mL in 1 VIAL | — | — | 2000-08-10 | — | Active |
| 63323-0010-96 63323-010-96 | 25 VIAL, MULTI-DOSE in 1 TRAY / 20 mL in 1 VIAL, MULTI-DOSE | — | — | 2000-08-10 | — | Active |
| 63323-0010-94 You're viewing this | 25 VIAL, MULTI-DOSE in 1 TRAY / 2 mL in 1 VIAL, MULTI-DOSE | $1.30 / mL | $65.13 | 2000-08-10 | — | Active |
| 63323-0010-95 63323-010-95 | 25 VIAL, MULTI-DOSE in 1 TRAY / 20 mL in 1 VIAL, MULTI-DOSE | — | — | 2000-08-10 | — | Active |
This pack effectively ties for the lowest per-mL cost of the 2 priced pack sizes ($1.30 NADAC).
This pack accounts for about 3.6% of this product's recent Medicaid fills; most go to a different pack size. See all packs ↓
Pack size FAQ
What quantity is in this package?
What NDC number is used to bill for this package of Gentamicin 40 mg/mL Injection, Solution?
Prices are the latest CMS NADAC pharmacy acquisition cost per NDC; per-pack figures are per-unit × pack quantity, shown only when the pack is denominated in the same measure NADAC prices.
Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Gentamicin 40 mg/mL 00143-9128-25 | Hikma | 25 vials | $1.303 | AP | Availability likely | — |
| Gentamicin 40 mg/mL 55150-0402-25 | Eugia | 25 vials | $1.303 | AP | Availability likely | — |
| Gentamicin 40 mg/mLthis 63323-0010-94 | Fresenius | 25 vials | $1.303 | AP | Availability likely | — |
| Gentamicin Sulfate 40 mg/mL 00409-1207-03 | Hospira, | 25 vials | $1.303 | AP | Availability likely | — |
| Gentamicin 40 mg/mL 00143-9129-10 | Hikma | 10 vials | — | AP | FDA listed | — |
| Gentamicin 40 mg/mL 00404-9866-20 | Henry | 1 vial | — | AP | FDA listed | — |
| Gentamicin 40 mg/mL 51662-1508-03 | HF | 25 pouches | — | AP | FDA listed | — |
| Gentamicin 40 mg/mL 55150-0403-25 | Eugia | 25 vials | — | AP | FDA listed | — |
| Gentamicin 40 mg/mL 71872-7311-01 | Medical | 1 vial | — | AP | FDA listed | — |
| Gentamicin Sulfate 40 mg/mL 71872-7216-01 | Medical | 1 vial | — | AP | FDA listed | — |
| Gentamicin Sulfate 40 mg/mL 51662-1597-03 | HF | 25 pouches | — | AP | FDA listed | — |
| Gentamicin Sulfate 40 mg/mL 71872-7337-01 | Medical | 1 vial | — | AP | FDA listed | — |
| Gentamicin Sulfate 40 mg/mL 00404-9865-02 | Henry | 1 vial | — | AP | FDA listed | — |
| Gentamicin Sulfate 40 mg/mL 55154-2392-05 | Cardinal | 5 vials | — | AP | FDA listed | — |
Where does this data come from?
- FDA openFDA NDC Directory · synced Oct 8, 2026
- FDA Orange Book · refreshed Oct 3, 2026
- CMS NADAC weekly file · file of Oct 7, 2026
Availability & generic status
This product is an FDA-approved generic. Other versions of the same drug are listed under Therapeutic equivalents, least expensive first.
Where does this data come from?
- FDA Orange Book · refreshed Oct 3, 2026
Inactive Ingredients / Excipients
Inactive ingredients, also called excipients, are components of the drug product other than the active ingredient. They may include fillers, dyes, coatings, preservatives, flavors, or other formulation ingredients.
🧪 Avoiding an ingredient? See Gentamicin Injection inactive ingredients by manufacturer: every current product's list side by side, so you can ask your pharmacy for the version that does not list it.
Where does this data come from?
IACT rows and label-wide narrative are kept separate; availability and product-level specificity depend on the submitted label.- FDA label on DailyMed · label index refreshed Oct 6, 2026
- FDA openFDA NDC Directory · synced Oct 8, 2026
Inactive ingredient FAQ
Are inactive ingredients the same for every manufacturer?
Why might an inactive ingredient be missing?
Can inactive ingredients matter?
Manufacturer & labeler
More NDCs from Fresenius Kabi USA, LLC labeler code 63323
- Chloramphenicol Sodium Succinate 1 g/10mL Injection, Powder, Lyophilized, For Solution NDC 63323-011-15
- Oxytocin 10 [USP'U]/mL Injection, Solution NDC 63323-012-01
- Thiamine 100 mg/mL Injection, Solution NDC 63323-013-02
- Mannitol 250 mg/mL Injection, Solution NDC 63323-024-25
- Chorionic Gonadotropin Kit NDC 63323-030-11
- SODIUM ACETATE 4 meq/100mL Injection, Solution, Concentrate NDC 63323-032-00
Where does this data come from?
- FDA openFDA NDC Directory · synced Oct 8, 2026
- Drugs@FDA
Full prescribing information FDA SPL
🚨 Boxed Warning ▾
BOXED WARNING Patients treated with aminoglycosides should be under close clinical observation because of the potential toxicity associated with their use. As with other aminoglycosides, gentamicin injection is potentially nephrotoxic. The risk of nephrotoxicity is greater in patients with impaired renal function and in those who receive high dosage of prolonged therapy.
Neurotoxicity manifested by ototoxicity, both vestibular and auditory, can occur in patients treated with gentamicin, primarily in those with pre-existing renal damage and in patients with normal renal function treated with higher doses and/or for longer periods than recommended. Aminoglycoside-induced ototoxicity is usually irreversible. Other manifestations of neurotoxicity may include numbness, skin tingling, muscle twitching and convulsions.
Renal and eighth cranial nerve function should be closely monitored, especially in patients with known or suspected reduced renal function at onset of therapy and also in those whose renal function is initially normal but who develop signs of renal dysfunction during therapy. Urine should be examined for decreased specific gravity, increased excretion of protein and the presence of cells or casts. Blood urea nitrogen (BUN), serum creatinine or creatinine clearance should be determined periodically.
When feasible, it is recommended that serial audiograms be obtained in patients old enough to be tested, particularly high-risk patients. Evidence of ototoxicity (dizziness, vertigo, tinnitus, roaring in the ears or hearing loss) or nephrotoxicity requires dosage adjustment or discontinuance of the drug. As with the other aminoglycosides, on rare occasions changes in renal and eighth cranial nerve function may not become manifest until soon after completion of therapy.
Serum concentrations of aminoglycosides should be monitored when feasible to assure adequate levels and to avoid potentially toxic levels. When monitoring gentamicin peak concentrations, dosage should be adjusted so that prolonged levels above 12 mcg/mL are avoided. When monitoring gentamicin trough concentrations, dosage should be adjusted so that levels above 2 mcg/mL are avoided.
Excessive peak and/or trough serum concentrations of aminoglycosides may increase the risk of renal and eighth cranial nerve toxicity. In the event of overdosage or toxic reactions, hemodialysis may aid in the removal of gentamicin from the blood, especially if renal function is, or becomes, compromised. The rate of removal of gentamicin is considerably lower by peritoneal dialysis than it is by hemodialysis.
In the newborn infant, exchange transfusions may also be considered. Concurrent and/or sequential systemic or topical use of other potentially neurotoxic and/or nephrotoxic drugs, such as cisplatin, cephaloridine, kanamycin, amikacin, neomycin, polymyxin B, colistin, paromomycin, streptomycin, tobramycin, vancomycin and viomycin, should be avoided. Other factors which may increase patient risk of toxicity are advanced age and dehydration.
The concurrent use of gentamicin with potent diuretics, such as ethacrynic acid or furosemide, should be avoided, since certain diuretics by themselves may cause ototoxicity. In addition, when administered intravenously, diuretics may enhance aminoglycoside toxicity by altering the antibiotic concentration in serum and tissue. Aminoglycosides can cause fetal harm when administered to a pregnant woman (see WARNINGS section).
🎯 Indications and Usage ▾
INDICATIONS AND USAGE To reduce the development of drug-resistant bacteria and maintain the effectiveness of Gentamicin Injection, USP and other antibacterial drugs, Gentamicin Injection, USP should be used only to treat or prevent infections that are proven or strongly suspected to be caused by susceptible bacteria. When culture and susceptibility information are available, they should be considered in selecting or modifying antibacterial therapy. In the absence of such data, local epidemiology and susceptibility patterns may contribute to the empiric selection of therapy.
Gentamicin Injection, USP is indicated in the treatment of serious infections caused by susceptible strains of the following microorganisms: Pseudomonas aeruginosa, Proteus species (indole-positive and indole-negative), Escherichia coli, Klebsiella-Enterobacter-Serratia species, Citrobacter species and Staphylococcus species (coagulase-positive and coagulase-negative). Clinical studies have shown gentamicin injection to be effective in bacterial neonatal sepsis; bacterial septicemia and serious bacterial infections of the central nervous system (meningitis), urinary tract, respiratory tract, gastrointestinal tract (including peritonitis), skin, bone and soft tissue (including burns).
Aminoglycosides, including gentamicin, are not indicated in uncomplicated initial episodes of urinary tract infections unless the causative organisms are susceptible to these antibiotics and are not susceptible to antibiotics having less potential for toxicity. Specimens for bacterial culture should be obtained to isolate and identify causative organisms and to determine their susceptibility to gentamicin. Gentamicin injection may be considered as initial therapy in suspected or confirmed gram-negative infections, and therapy may be instituted before obtaining results of susceptibility testing.
The decision to continue therapy with this drug should be based on the results of susceptibility tests, the severity of the infection and the important additional concepts contained in the boxed WARNINGS . If the causative organisms are resistant to gentamicin, other appropriate therapy should be instituted. In serious infections when the causative organisms are unknown, gentamicin injection may be administered as initial therapy in conjunction with a penicillin-type or cephalosporin-type drug before obtaining results of susceptibility testing.
If anaerobic organisms are suspected as etiologic agents, consideration should be given to using other suitable antimicrobial therapy in conjunction with gentamicin. Following identification of the organism and its susceptibility, appropriate antibiotic therapy should then be continued. Gentamicin injection has been used effectively in combination with carbenicillin for the treatment of life-threatening infections caused by Pseudomonas aeruginosa.
It has also been found effective when used in conjunction with a penicillin-type drug for treatment of endocarditis caused by group D streptococci. Gentamicin injection has also been shown to be effective in the treatment of serious staphylococcal infections. While not the antibiotic of first choice, gentamicin injection may be considered when penicillins or other less potentially toxic drugs are contraindicated and bacterial susceptibility tests and clinical judgment indicate its use.
It may also be considered in mixed infections caused by susceptible strains of staphylococci and gram-negative organisms. In the neonate with suspected bacterial sepsis or staphylococcal pneumonia, a penicillin-type drug is also usually indicated as concomitant therapy with gentamicin.
⏱️ Dosage and Administration ▾
DOSAGE AND ADMINISTRATION Gentamicin injection may be given IM or IV. The patient’s pretreatment body weight should be obtained for calculation of correct dosage. The dosage of aminoglycosides in obese patients should be based on an estimate of the lean body mass.
It is desirable to limit the duration of treatment with aminoglycosides to short term. PATIENTS WITH NORMAL RENAL FUNCTION Adults The recommended dosage of gentamicin injection for patients with serious infections and normal renal function is 3 mg/kg/day, administered in three equal doses every eight hours (Table I ) . For patients with life-threatening infections, dosages up to 5 mg/kg/day may be administered in three or four equal doses.
This dosage should be reduced to 3 mg/kg/day as soon as clinically indicated (Table I) . It is desirable to measure both peak and trough serum concentrations of gentamicin to determine the adequacy and safety of the dosage. When such measurements are feasible, they should be carried out periodically during therapy to assure adequate but not excessive drug levels.
For example, the peak concentration (at 30 to 60 minutes after IM injection) is expected to be in the range of 4 to 6 mcg/mL. When monitoring peak concentrations after IM or IV administration, dosage should be adjusted so that prolonged levels above 12 mcg/mL are avoided. When monitoring trough concentrations (just prior to the next dose), dosage should be adjusted so that levels above 2 mcg/mL are avoided.
Determination of the adequacy of a serum level for a particular patient must take into consideration the susceptibility of the causative organism, the severity of the infection and the status of the patient’s host-defense mechanisms. In patients with extensive burns, altered pharmacokinetics may result in reduced serum concentrations of aminoglycosides. In such patients treated with gentamicin, measurement of serum concentrations is recommended as a basis for dosage adjustment.
TABLE I DOSAGE SCHEDULE GUIDE FOR ADULTS WITH NORMAL RENAL FUNCTION (Dosage at Eight-Hour Intervals) 40 mg per mL Patient’s Weight* Usual Dose for Serious Infections 1 mg/kg q8h (3 mg/kg/day) Dose for Life-Threatening Infections (Reduce As Soon As Clinically Indicated) 1.7 mg/kg q8h** (5 mg/kg/day) kg (lb) mg/dose mL/dose mg/dose mL/dose q8h q8h 40 ( 88) 40 1 66 1.6 45 ( 99) 45 1.1 75 1.9 50 (110) 50 1.25 83 2.1 55 (121) 55 1.4 91 2.25 60 (132) 60 1.5 100 2.5 65 (143) 65 1.6 108 2.7 70 (154) 70 1.75 116 2.9 75 (165) 75 1.9 125 3.1 80 (176) 80 2 133 3.3 85 (187) 85 2.1 141 3.5 90 (198) 90 2.25 150 3.75 95 (209) 95 2.4 158 4 100 (220) 100 2.5 166 4.2 * The dosage of aminoglycosides in obese patients should be based on an estimate of the lean body mass. **for q6h schedules, dosage should be recalculated.
Children 6 to 7.5 mg/kg/day (2 to 2.5 mg/kg administered every eight hours). Infants and Neonates 7.5 mg/kg/day (2.5 mg/kg administered every eight hours). Premature or Full-Term Neonates One Week of Age or Less 5 mg/kg/day (2.5 mg/kg administered every 12 hours).
For further information concerning the use of gentamicin in infants and children, see gentamicin injection (pediatric) product information. The usual duration of treatment for all patients is 7 to 10 days. In difficult and complicated infections, a longer course of therapy may be necessary.
In such cases monitoring of renal, auditory and vestibular functions is recommended, since toxicity is more apt to occur with treatment extended for more than 10 days. Dosage should be reduced if clinically indicated. FOR INTRAVENOUS ADMINISTRATION The IV administration of gentamicin may be particularly useful for treating patients with bacterial septicemia or those in shock.
It may also be the preferred route of administration for some patients with congestive heart failure, hematologic disorders, severe burns or those with reduced muscle mass. For intermittent IV administration in adults, a single dose of gentamicin injection may be diluted in 50 to 2… [Excerpted — this section continues on DailyMed.]
⛔ Contraindications ▾
CONTRAINDICATIONS Hypersensitivity to gentamicin is a contraindication to its use. A history of hypersensitivity or serious toxic reactions to other aminoglycosides may contraindicate use of gentamicin because of the known cross-sensitivity of patients to drugs in this class.
⚠️ Warnings ▾
WARNINGS (See boxed WARNINGS .) Contains sodium metabisulfite, a sulfite that may cause allergic-type reactions including anaphylactic symptoms and life-threatening or less severe asthmatic episodes in certain susceptible people. The overall prevalence of sulfite sensitivity in the general population is unknown and probably low. Sulfite sensitivity is seen more frequently in asthmatic than in non-asthmatic people.
Aminoglycosides can cause fetal harm when administered to a pregnant woman. Aminoglycoside antibiotics cross the placenta, and there have been several reports of total irreversible bilateral congenital deafness in children whose mothers received streptomycin during pregnancy. Serious side effects to mother, fetus or newborn have not been reported in the treatment of pregnant women with other aminoglycosides.
Animal reproduction studies conducted on rats and rabbits did not reveal evidence of impaired fertility or harm to the fetus due to gentamicin sulfate. It is not known whether gentamicin sulfate can cause fetal harm when administered to a pregnant woman or can affect reproduction capacity. If gentamicin is used during pregnancy or if the patient becomes pregnant while taking gentamicin, she should be apprised of the potential hazard to the fetus.
🤒 Adverse Reactions ▾
ADVERSE REACTIONS Nephrotoxicity Adverse renal effects, as demonstrated by the presence of casts, cells or protein in the urine or by rising BUN, NPN, serum creatinine or oliguria, have been reported. They occur more frequently in patients with a history of renal impairment (especially if dialysis is required) and in patients treated for longer periods or with larger doses than recommended. Neurotoxicity Serious adverse effects on both vestibular and auditory branches of the eighth nerve have been reported, primarily in patients with renal impairment (especially if hemodialysis is required) and in patients on high doses and/or prolonged therapy.
Symptoms include dizziness, vertigo, tinnitus, roaring in the ears and also hearing loss, which, as with the other aminoglycosides, may be irreversible. Hearing loss is usually manifested initially by diminution of high-tone acuity. Other factors which may increase the risk of toxicity include excessive dosage, dehydration and previous exposure to other ototoxic drugs.
Peripheral neuropathy or encephalopathy, including numbness, skin tingling, muscle twitching, convulsions and a myasthenia gravis-like syndrome have been reported. NOTE: The risk of toxic reactions is low in patients with normal renal function who did not receive gentamicin sulfate at higher doses or for longer periods of time than recommended. Other reported adverse reactions possibly related to gentamicin include: respiratory depression, lethargy, confusion, depression, visual disturbances, decreased appetite, weight loss and hypotension and hypertension; rash, itching, urticaria, generalized burning, laryngeal edema, anaphylactoid reactions, fever and headache; nausea, vomiting, increased salivation and stomatitis; purpura, pseudotumor cerebri, acute organic brain syndrome, pulmonary fibrosis, alopecia, joint pain, transient hepatomegaly and splenomegaly.
Laboratory abnormalities possibly related to gentamicin include: increased levels of serum transaminase (SGOT, SGPT), serum LDH and bilirubin; decreased serum calcium, magnesium, sodium and potassium; anemia, leukopenia, granulocytopenia, transient agranulocytosis, eosinophilia, increased and decreased reticulocyte counts and thrombocytopenia. While clinical laboratory test abnormalities may be isolated findings, they may also be associated with clinically related signs and symptoms. For example, tetany and muscle weakness may be associated with hypomagnesemia, hypocalcemia and hypokalemia.
While the local tolerance of gentamicin sulfate is generally excellent, there has been an occasional report of pain at the injection site. Subcutaneous atrophy or fat necrosis suggesting local irritation has been reported rarely.
Nephrotoxicity Adverse renal effects, as demonstrated by the presence of casts, cells or protein in the urine or by rising BUN, NPN, serum creatinine or oliguria, have been reported. They occur more frequently in patients with a history of renal impairment (especially if dialysis is required) and in patients treated for longer periods or with larger doses than recommended.
Neurotoxicity Serious adverse effects on both vestibular and auditory branches of the eighth nerve have been reported, primarily in patients with renal impairment (especially if hemodialysis is required) and in patients on high doses and/or prolonged therapy. Symptoms include dizziness, vertigo, tinnitus, roaring in the ears and also hearing loss, which, as with the other aminoglycosides, may be irreversible. Hearing loss is usually manifested initially by diminution of high-tone acuity.
Other factors which may increase the risk of toxicity include excessive dosage, dehydration and previous exposure to other ototoxic drugs. Peripheral neuropathy or encephalopathy, including numbness, skin tingling, muscle twitching, convulsions and a myasthenia gravis-like syndrome have been reported. NOTE: The risk of toxic reactions is low in patients with normal renal function who did not receive g… [Excerpted — this section continues on DailyMed.]
🆘 Overdosage ▾
OVERDOSAGE In the event of overdosage or toxic reactions, hemodialysis may aid in the removal of gentamicin from the blood, especially if renal function is, or becomes, compromised. The rate of removal of gentamicin is considerably lower by peritoneal dialysis than it is by hemodialysis.
🧬 Clinical Pharmacology ▾
CLINICAL PHARMACOLOGY After intramuscular (IM) administration of gentamicin sulfate, peak serum concentrations usually occur between 30 and 60 minutes and serum levels are measurable for six to eight hours. When gentamicin is administered by intravenous (IV) infusion over a two-hour period, the serum concentrations are similar to those obtained by IM administration. In patients with normal renal function, peak serum concentrations of gentamicin (mcg/mL) are usually up to four times the single IM dose (mg/kg); for example, a 1 mg/kg injection in adults may be expected to result in a peak serum concentration up to 4 mcg/mL; a 1.5 mg/kg dose may produce levels up to 6 mcg/mL.
While some variation is to be expected due to a number of variables such as age, body temperature, surface area and physiologic differences, the individual patient given the same dose tends to have similar levels in repeated determinations. Gentamicin administered at 1 mg/kg every eight hours for the usual 7 to 10 day treatment period to patients with normal renal function does not accumulate in the serum. Gentamicin, like all aminoglycosides, may accumulate in the serum and tissues of patients treated with higher doses and/or for prolonged periods, particularly in the presence of impaired renal function.
In adult patients, treatment with gentamicin dosages of 4 mg/kg/day or higher for 7 to 10 days may result in a slight, progressive rise in both peak and trough concentrations. In patients with impaired renal function, gentamicin is cleared from the body more slowly than in patients with normal renal function. The more severe the impairment, the slower the clearance.
(Dosage must be adjusted.) Since gentamicin is distributed in extra-cellular fluid, peak serum concentrations may be lower than usual in adult patients who have a large volume of this fluid. Serum concentrations of gentamicin in febrile patients may be lower than those in afebrile patients given the same dose. When body temperature returns to normal, serum concentrations of the drug may rise.
Febrile and anemic states may be associated with a shorter than usual serum half-life. (Dosage adjustment is usually not necessary.) In severely burned patients, the half-life may be significantly decreased and resulting serum concentrations may be lower than anticipated from the mg/kg dose. Protein binding studies have indicated that the degree of gentamicin binding is low; depending upon the methods used for testing, this may be between 0 and 30%.
After initial administration to patients with normal renal function, generally 70% or more of the gentamicin dose is recoverable in the urine in 24 hours; concentrations in urine above 100 mcg/mL may be achieved. Little, if any, metabolic transformation occurs; the drug is excreted principally by glomerular filtration. After several days of treatment, the amount of gentamicin excreted in the urine approaches the daily dose administered.
As with other aminoglycosides, a small amount of the gentamicin dose may be retained in the tissues, especially in the kidneys. Minute quantities of aminoglycosides have been detected in the urine weeks after drug administration was discontinued. Renal clearance of gentamicin is similar to that of endogenous creatinine.
In patients with marked impairment of renal function, there is a decrease in the concentration of aminoglycosides in urine and in their penetration into defective renal parenchyma. This decreased drug excretion, together with the potential nephrotoxicity of aminoglycosides, should be considered when treating such patients who have urinary tract infections. Probenecid does not affect renal tubular transport of gentamicin.
The endogenous creatinine clearance rate and the serum creatinine level have a high correlation with the half-life of gentamicin in serum. Results of these tests may serve as guides for adjusting dosage in patients with renal impairment (see DOSAGE AND ADMINISTRATION ). Following parenteral admini… [Excerpted — this section continues on DailyMed.]
📦 How Supplied / Storage and Handling ▾
HOW SUPPLIED Gentamicin Injection, USP, containing gentamicin 40 mg/mL is supplied as follows: Product No. NDC No. Strength NP1020 63323-010-96 800 mg/20 mL (40 mg/mL) 20 mL fill in a 20 mL flip-top vial, in packages of 25.
Also available, Gentamicin Injection (Pediatric), 10 mg/mL, supplied in 2 mL (20 mg) vials in packages of 25. Store at 20° to 25°C (68° to 77°F) [see USP Controlled Room Temperature]. N+ and NOVAPLUS are registered trademarks of Novation, LLC.
📋 Description ▾
DESCRIPTION Gentamicin sulfate, a water-soluble antibiotic of the aminoglycoside group, is derived by the growth of Micromonospora purpurea , an actinomycete. It has the following structural formula. Gentamicin injection is a sterile, nonpyrogenic aqueous solution for parenteral administration.
Each mL contains: Gentamicin sulfate equivalent to 40 mg gentamicin, methylparaben 1.8 mg and propylparaben 0.2 mg as preservatives, sodium metabisulfite 3.2 mg and edetate disodium 0.1 mg, Water for Injection q.s. Sodium hydroxide and/or sulfuric acid may have been added for pH adjustment. gent.stru
⚠️ Precautions ▾
PRECAUTIONS General Prescribing Gentamicin Injection, USP in the absence of a proven or strongly suspected bacterial infection or a prophylactic indication is unlikely to provide benefit to the patient and increases the risk of the development of drug-resistant bacteria. Neurotoxic and nephrotoxic antibiotics may be almost completely absorbed from body surfaces (except urinary bladder) after local irrigation and after topical application during surgical procedures. The potential toxic effects of antibiotics administered in this fashion (neuromuscular blockage, respiratory paralysis, oto- and nephrotoxicity) should be considered (see boxed WARNINGS ).
Increased nephrotoxicity has been reported following concomitant administration of aminoglycoside antibiotics and cephalosporins. Neuromuscular blockade and respiratory paralysis have been reported in the cat receiving high doses (40 mg/kg) of gentamicin. The possibility of these phenomena occurring in man should be considered if aminoglycosides are administered by any route to patients receiving anesthetics, or to patients receiving neuromuscular blocking agents, such as succinylcholine, tubocurarine or decamethonium, or in patients receiving massive transfusions of citrate-anticoagulated blood.
If neuromuscular blockade occurs, calcium salts may reverse it. Aminoglycosides should be used with caution in patients with neuromuscular disorders, such as myasthenia gravis or parkinsonism, since these drugs may aggravate muscle weakness because of their potential curare-like effects on the neuromuscular junction. During or following gentamicin therapy, paresthesias, tetany, positive Chvostek and Trousseau signs and mental confusion have been described in patients with hypomagnesemia, hypocalcemia and hypokalemia.
When this has occurred in infants, tetany and muscle weakness has been described. Both adults and infants required corrective electrolyte therapy. Elderly patients may have reduced renal function which may not be evident in the results of routine screening tests such as BUN or serum creatinine.
A creatinine clearance determination may be more useful. Monitoring of renal function during treatment with gentamicin, as with other aminoglycosides, is particularly important in such patients. A Fanconi-like syndrome, with aminoaciduria and metabolic acidosis has been reported in some adults and infants being given gentamicin injections.
Cross-allergenicity among aminoglycosides has been demonstrated. Patients should be well hydrated during treatment. Although the in vitro mixing of gentamicin and carbenicillin results in a rapid and significant inactivation of gentamicin, this interaction has not been demonstrated in patients with normal renal function who received both drugs by different routes of administration.
A reduction in gentamicin serum half-life has been reported in patients with severe renal impairment receiving carbenicillin concomitantly with gentamicin. Treatment with gentamicin may result in overgrowth of nonsusceptible organisms. If this occurs, appropriate therapy is indicated.
See boxed WARNINGS regarding concurrent use of potent diuretics and regarding concurrent and/or sequential use of other neurotoxic and/or for other essential information. Information for Patients Patients should be counseled that antibacterial drugs including Gentamicin Injection, USP should only be used to treat bacterial infections. They do not treat viral infections (e.g., the common cold).
When Gentamicin Injection, USP is prescribed to treat a bacterial infection, patients should be told that although it is common to feel better early in the course of therapy, the medication should be taken exactly as directed. Skipping doses or not completing the full course of therapy may (1) decrease the effectiveness of the immediate treatment and (2) increase the likelihood that bacteria will develop resistance and will not be treatable by Gentamicin Injection, USP or other antibacterial drugs in th… [Excerpted — this section continues on DailyMed.]
📄 Package Label / Principal Display Panel ▾
PACKAGE LABEL - PRINCIPAL DISPLAY - Gentamicin 20 mL Multiple Dose Vial Label NDC 63323-010-96 NP1020 Gentamicin Injection, USP For IM or IV Use. 800 mg/20 mL (40 mg/mL) Gentamicin equivalent Must be diluted for IV use. Rx only Multiple Dose Vial np1020-vial