Tobramycin Inhalation Solution Pak 300 mg/5mL Solution
🆔 Identity & classification
Where does this data come from?
🏷️ RxNorm drug class
This medicine belongs to the Aminoglycoside Antibacterial class.
Where does this data come from?
🏭 Manufacturer & labeler
Where does this data come from?
🩺 Clinical
- Tobramycin is an antibiotic, but the form you have determines exactly what it treats. If you're inhaling it through a nebulizer or using the TOBI Podhaler device, it's being used t...
- That on-off cycle is by design. Inhaling tobramycin for 28 days helps knock back the Pseudomonas bacteria in your lungs, and then the 28-day break gives your body a rest and helps...
- Why do I have to take the inhaled form for 28 days and then stop for 28 days?
- Absolutely not — this is really important. The TOBI Podhaler capsules must never be swallowed. The medicine only works when it's inhaled directly into your lungs using the Podhaler...
Patient education
Supplement & herbal interactions
Some supplements/herbs that may interact with Tobramycin — tap one for details:
Tobramycin 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?
Ask a licensed pharmacist directly — free, answered by our team.
🧪 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.
💡 Tap an ingredient (hover on desktop) to see what it is and why it’s used.
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UNII 451W47IQ8X
Sodium chloride is common table salt. It's used in medicines as a buffer to maintain proper pH, as a filler to add bulk, or to adjust the osmotic balance in liquid formulations.
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UNII O40UQP6WCF
A strong acid used in small amounts to adjust and maintain the pH balance of a medicine, helping ensure stability and proper dissolution of the active ingredients.
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UNII 059QF0KO0R
Water is a liquid solvent that dissolves and mixes ingredients together in liquid medicines, syrups, and injections. It helps distribute the active drug evenly throughout the product.
3 inactive ingredients listed in the exact product block matched to this NDC.
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ingredient classCode="IACT" elements from the exact product block matched by this NDC. Label-section narrative from DailyMed / the openFDA label index is shown separately when available.Inactive ingredient FAQ
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💲 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 | Not in the retail survey — common for institutional, discontinued, or low-volume packs. | |
| Medicaid paysCMS SDUD · 12 mo | $12.51 | $3,503.30 / 280 ml |
| Medicare drug plans payPart D · quarterly | No Part D plan price is available for this NDC in our data. | |
| Medicare Part B allowsASP · J7682 | $12.305 / J7682 unit | — |
Where does this data come from?
🧾 Billing & reimbursement
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🔁 Therapeutic equivalents
| Product | Labeler | Pack | NADAC/unit | TE | Status | Price vs. this |
|---|---|---|---|---|---|---|
| Tobramycin 300 mg/5mL 00093-4085-63 | Teva | 56 ampules | $1.085 | AN | Availability likely | — |
| Tobramycin 300 mg/5mL 42571-0408-92 | Micro | 14 pouches | $1.085 | AN | Availability likely | — |
| Tobramycin Inhalation Solution 300 mg/5mL 43598-0605-56 | Dr. | 14 pouches | $1.085 | AN | Availability likely | — |
| Tobramycin 300 mg/5mL 47335-0171-49 | Sun | 14 pouches | $1.085 | AN | Availability likely | — |
| Tobramycin 300 mg/5mL 65162-0914-46 | Amneal | 56 ampules | $1.085 | AN | Availability likely | — |
| Tobramycin 300 mg/5mL 67877-0678-70 | Ascend | 56 pouches | $1.085 | AN | Availability likely | — |
| Tobramycin 300 mg/5mL 68180-0962-56 | Lupin | 56 pouches | $1.085 | AN | Availability likely | — |
| Tobramycin 300 mg/5mL 70756-0604-56 | Lifestar | 14 pouches | $1.085 | AN | Availability likely | — |
| Tobramycin 300 mg/5mL 72603-0430-56 | NorthStar | 14 pouches | $1.085 | AN | Availability likely | — |
| Tobramycin 300 mg/5mL 76204-0029-56 | Ritedose | 14 pouches | $1.085 | AN | Availability likely | — |
| Kitabis Pak 300 mg/5mL 24492-0850-56 | Pari | 14 pouches | — | AN | FDA listed | — |
| Tobi 300 mg/5mL 49502-0345-73 | Viatris | 56 pouches | — | AN | FDA listed | — |
| Tobramycin 300 mg/5mL 59651-0129-56 | Aurobindo | 14 pouches | — | — | FDA listed | — |
| Tobramycin 300 mg/5mL 60687-0731-83 | American | 30 pouches | — | AN | FDA listed | — |
| Tobramycin Inhalation Solution Pak 300 mg/5mLthis 70644-0899-99 | Genericus, | 14 pouches | — | AN | FDA listed | — |
Where does this data come from?
⏳ Availability & generic status
FDA-approved generic versions are listed, and recent pricing/market data suggests they may be available — see Therapeutic equivalents.
Where does this data come from?
🗺️ Medicaid utilization & spend
📊 Medicare Part D spend CMS · PART D · 2026 (Q1)
📦 Packaging — all sizes for this product
| Package NDC | Description | Marketing start | Status |
|---|---|---|---|
| 70644-0899-99 You're viewing this | 14 POUCH in 1 CARTON (70644-899-99) / 4 AMPULE in 1 POUCH / 5 mL in 1 AMPULE | 2016-07-11 | Active |
🧭 About this NDC listing & data coverage
What data is (and isn’t) available for this NDC — tap to expand
| NDC identity (package / product / labeler codes) | ✓ Available |
| Labeler | ✓ Available |
| Product & package description | ✓ Available |
| Marketing category & status | ✓ Available |
| Active ingredient / dosage form / route | ✓ Available |
| FDA label (SPL via DailyMed) | ✓ Available |
| Package photos | — Not published for this NDC No photo available yet for this listing. |
| Inactive ingredients (structured) | ✓ Available |
| NADAC pharmacy acquisition price (CMS) | — Not published for this NDC CMS publishes NADAC only for NDCs reported in its retail-pharmacy survey. |
| Orange Book / therapeutic-equivalence data | ✓ Available |
| HCPCS J-code billing crosswalk | ✓ Available |
| Medicaid utilization (CMS SDUD) | ✓ Available |
Questions about this listing
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📄 Full prescribing information FDA SPL
🎯 Indications and Usage ▾
1 INDICATIONS AND USAGE TOBRAMYCIN INHALATION SOLUTION PAK (co-packaging of tobramycin inhalation solution and PARI LC PLUS Reusable Nebulizer) is indicated for the management of cystic fibrosis in adults and pediatric patients 6 years of age and older with P. aeruginosa . Safety and efficacy have not been demonstrated in patients under the age of 6 years, patients with FEV 1 < 25% or > 75% predicted, or patients colonized with Burkholderia cepacia [see Clinical Studies ( 14 )]. TOBRAMYCIN INHALATION SOLUTION PAK contains tobramycin, an aminoglycoside antibacterial drug indicated for the management of cystic fibrosis in adults and pediatric patients 6 years of age and older with Pseudomonas aeruginosa ( 1 ).
⏱️ Dosage and Administration ▾
2 DOSAGE AND ADMINISTRATION TOBRAMYCIN INHALATION SOLUTION PAK is a co-packaging of tobramycin inhalation solution with a PARI LC PLUS ® Reusable Nebulizer ( 2.1 ). Administer tobramycin inhalation solution as one single–use ampule (300 mg/5 mL) twice a day by oral inhalation in alternating periods of 28 days on drug, followed by 28 days off drug ( 2.1 ). Dosage is not adjusted by weight ( 2.1 ).
Take doses as close to 12 hours apart as possible; but not less than 6 hours apart ( 2.1 ). Administer each 300 mg dose using the PARI LC PLUS Reusable Nebulizer and DeVilbiss ® Pulmo-Aide ® compressor ( 2.2 ).
2.1Dosing Information TOBRAMYCIN INHALATION SOLUTION PAK is a co-packaging of tobramycin inhalation solution ampules with a PARI LC PLUS Reusable Nebulizer. Administer as follows: One single-use ampule (300 mg/5 mL) of tobramycin inhalation solution twice a day by oral inhalation in alternating periods of 28 days on drug, followed by 28 days off drug. The 300 mg/5 mL dose of tobramycin inhalation solution is the same for all patients regardless of age or weight.
The doses should be taken as close to 12 hours apart as possible; they should not be taken less than 6 hours apart.
2.2Administration of Tobramycin Inhalation Solution Each dose of tobramycin inhalation solution is administered by oral inhalation using only the co-packaged PARI LC PLUS Reusable Nebulizer (Model No. 022B81-TA) included in the TOBRAMYCIN INHALATION SOLUTION PAK, along with a DeVilbiss Pulmo-Aide air compressor (Model No. 5650D).
Tobramycin inhalation solution is not for subcutaneous, intravenous or intrathecal administration. Prior to administration, read the Patient Information/Instructions for Use for TOBRAMYCIN INHALATION SOLUTION PAK for detailed information on how to use TOBRAMYCIN INHALATION SOLUTION PAK and follow the manufacturer's instructions for use and care of the DeVilbiss Pulmo-Aide air compressor. The entire tobramycin inhalation solution treatment should take approximately 15 minutes to complete.
Continue treatment until all the tobramycin inhalation solution has been delivered, and there is no longer any mist being produced. Tobramycin inhalation solution should not be diluted or mixed with other drugs including dornase alfa in the nebulizer. Instruct patients on multiple therapies to take their medications prior to inhaling the tobramycin inhalation solution, or as directed by their physician.
Tobramycin inhalation solution should not be used if it is cloudy, if there are particles in the solution, or if it has been stored at room temperature for more than 28 days.
💊 Dosage Forms and Strengths ▾
3 DOSAGE FORMS AND STRENGTH Inhalation solution: 300 mg/5 mL in a single-use ampule. Inhalation Solution: 300 mg in a single-use 5 mL ampule ( 3 ).
⛔ Contraindications ▾
4 CONTRAINDICATIONS Tobramycin inhalation solution is contraindicated in patients with a known hypersensitivity to any aminoglycoside. Known hypersensitivity to any aminoglycoside ( 4 ).
⚠️ Warnings and Cautions ▾
5 WARNINGS AND PRECAUTIONS Bronchospasm: Can occur with inhalation of tobramycin inhalation solution. Treat as medically appropriate, if it occurs ( 5.1 ). Ototoxicity: Tinnitus and hearing loss have been reported in patients receiving tobramycin inhalation solution.
If noted, manage as medically appropriate, including potentially discontinuing tobramycin inhalation solution ( 5.2 ). Nephrotoxicity: Has been associated with aminoglycosides as a class. If nephrotoxicity develops, manage the patient as medically appropriate, including potentially discontinuing tobramycin inhalation solution ( 5.3 ).
Neuromuscular Disorders: Aminoglycosides may aggravate muscle weakness because of a potential curare-like effect on neuromuscular function. If neuromuscular blockade occurs, it may be reversed by the administration of calcium salts but mechanical assistance may be necessary ( 5.4 ). Embryo-Fetal Toxicity: Aminoglycosides can cause fetal harm ( 5.5 , 8.1 )
5.1Bronchospasm Bronchospasm can occur with inhalation of tobramycin inhalation solution. In clinical studies with tobramycin inhalation solution, changes in FEV1 measured after the inhaled dose were similar in tobramycin inhalation solution and placebo groups. Bronchospasm that occurs during the use of tobramycin inhalation solution should be treated as medically appropriate.
5.2Ototoxicity Ototoxicity with use of Tobramycin Inhalation Solution Transient tinnitus occurred in eight tobramycin inhalation solution treated patients versus no placebo patients in the clinical studies. Tinnitus may be a sentinel symptom of ototoxicity, and therefore the onset of this symptom warrants further clinical investigation. In postmarketing experience, patients receiving tobramycin inhalation solution have reported hearing loss.
Ototoxicity, manifested as both auditory and vestibular toxicity, has been reported with parenteral aminoglycosides. Vestibular toxicity may be manifested by vertigo, ataxia or dizziness. Patients with known or suspected auditory or vestibular dysfunction should be closely monitored when taking tobramycin inhalation solution.
Monitoring might include obtaining audiometric evaluations and serum tobramycin levels. If ototoxicity is noted, the patient should be managed as medically appropriate, including potentially discontinuing tobramycin inhalation solution [see Adverse Reactions ( 6.2 )] . Risk of Ototoxicity Due to Mitochondrial DNA Variants Cases of ototoxicity with aminoglycosides have been observed in patients with certain variants in the mitochondrially encoded 12S rRNA gene ( MT-RNR1 ), particularly the m.1555A>G variant.
Ototoxicity occurred in some patients even when their aminoglycoside serum levels were within the recommended range. Mitochondrial DNA variants are present in less than 1% of the general US population, and the proportion of the variant carriers who may develop ototoxicity as well as the severity of ototoxicity is unknown. In case of known maternal history of ototoxicity due to aminoglycoside use or a known mitochondrial DNA variant in the patient, consider alternative treatments other than aminoglycosides unless the increased risk of permanent hearing loss is outweighed by the severity of infection and lack of safe and effective alternative therapies.
5.3Nephrotoxicity Nephrotoxicity was not seen during clinical studies with tobramycin inhalation solution but has been associated with aminoglycosides as a class. Patients with known or suspected renal dysfunction or taking concomitant nephrotoxic drugs along with tobramycin inhalation solution should have serum concentrations of tobramycin and laboratory measurements of renal function obtained at the discretion of the treating physician. If nephrotoxicity develops, the patient should be managed as medically appropriate, including potentially discontinuing tobramycin inhalation solution.
5.4Neuromuscular Disorders Aminoglycosides, including tobramycin, may aggravate muscle weakness because of a po…
🤒 Adverse Reactions ▾
6 ADVERSE REACTIONS The following serious adverse reactions are described below and elsewhere in the labeling: Bronchospasm [ see Warnings and Precautions ( 5.1 )] Ototoxicity [ see Warnings and Precautions ( 5.2 )] The most common adverse reactions (> 5%) in patients treated with tobramycin inhalation solution were increased cough, pharyngitis, increased sputum, dyspnea, hemoptysis, decreased lung function, voice alteration, taste perversion and rash ( 6.1 ). To report SUSPECTED ADVERSE REACTIONS, contact 1-844-548-2247 or FDA at 1-800-FDA-1088 or www.fda.gov/medwatch
6.1Clinical Trials Experience Because clinical trials are conducted under widely varying conditions, adverse reaction rates observed in the clinical trials of a drug cannot be directly compared to rates in the clinical trials of another drug and may not reflect the rates observed in practice. Tobramycin inhalation solution was studied in two clinical studies in 258 cystic fibrosis patients ranging in age from 6 to 48 years. Patients received tobramycin inhalation solution in alternating periods of 28 days on and 28 days off drug in addition to their standard cystic fibrosis therapy for a total of 24 weeks.
Adverse reactions reported in these studies are described below: The most frequent adverse reactions in the tobramycin inhalation arm were cough, pharyngitis, and increased sputum (see Table 1 ). Thirty-three patients (13%) treated with tobramycin inhalation solution complained of voice alteration compared to 17 (7%) placebo patients. Voice alteration was more common in the on-drug periods.
Eight patients from the tobramycin inhalation solution group (3%) reported tinnitus compared to no placebo patients. All episodes were transient, resolved without discontinuation of the tobramycin inhalation solution treatment regimen, and were not associated with loss of hearing in audiograms. Table 1 lists the percent of patients with selected adverse reactions that occurred in > 5% of tobramycin inhalation solution patients during the two Phase III studies.
Table 1: Percent of Patients with Selected Adverse Reactions Occurring in > 5% of Tobramycin Inhalation Solution Patients 1 Includes reported decreases in pulmonary function tests or decreased lung volume on chest radiograph associated with intercurrent illness or study drug administration. Adverse Reaction Tobramycin Inhalation Solution (n=258) % Placebo (n=262) % Cough Increased 46.1
47.3Pharyngitis 38.0
39.3Sputum Increased 37.6
39.7Dyspnea 33.7
38.5Hemoptysis 19.4
23.7Lung Function Decrease 1 16.3
15.3Voice Alteration 12.8
6.5Taste Perversion 6.6
6.9Rash 5.4
6.1Selected adverse reactions that occurred in less than or equal to 5% of patients treated with tobramycin inhalation solution: Ear and labyrinth disorders Tinnitus Musculoskeletal and connective tissue disorders Myalgia Infections and infestations Laryngitis
6.2Postmarketing Experience The following adverse reactions have been identified during post approval use of tobramycin inhalation solution. Because these reactions 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. Ear and labyrinth disorders Hearing loss: Some of these reports occurred in patients with previous or concomitant treatment with systemic aminoglycosides.
Patients with hearing loss frequently reported tinnitus. [see Warnings and Precautions ( 5.2 )] Skin and subcutaneous tissue disorders Hypersensitivity, pruritus, urticaria, rash Nervous system disorders Aphonia, dysgeusia Respiratory, thoracic, and mediastinal disorders Bronchospasm [see Warnings and Precautions ( 5.1 )] , oropharyngeal pain
🔄 Drug Interactions ▾
7 DRUG INTERACTIONS Concurrent and/or sequential use with other drugs with neurotoxic, nephrotoxic or ototoxic potential should be avoided ( 7.1 ). Concomitant administration with ethacrynic acid, furosemide, urea, or intravenous mannitol is not recommended due to possible enhancement of aminoglycoside toxicity ( 7.2 ).
7.1Drugs with Neurotoxic, Nephrotoxic or Ototoxic Potential Concurrent and/or sequential use of tobramycin inhalation solution with other drugs with neurotoxic, nephrotoxic, or ototoxic potential should be avoided if possible.
7.2Diuretics Some diuretics can enhance aminoglycoside toxicity by altering aminoglycoside concentrations in serum and tissue. Tobramycin inhalation solution should not be administered concomitantly with ethacrynic acid, furosemide, urea, or intravenous mannitol.
👥 Use in Specific Populations ▾
8 USE IN SPECIFIC POPULATIONS
8.1Pregnancy Risk Summary Aminoglycosides can cause fetal harm. Published literature reports that use of streptomycin, an aminoglycoside, can cause total, irreversible, bilateral congenital deafness when administered to a pregnant woman [Warnings and Precautions ( 5.5 )] . Although there are no available data on TOBRAMYCIN INHALATION SOLUTION PAK use in pregnant women to inform a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes, systemic absorption of tobramycin following inhaled administration is expected to be minimal [see Clinical Pharmacology ( 12.3 )] .
There are risks to the mother associated with cystic fibrosis in pregnancy (see Clinical Considerations ) . In animal reproduction studies with subcutaneous administration of tobramycin in pregnant rats and rabbits during organogenesis there were no adverse developmental outcomes; however, ototoxicity was not evaluated in the offspring from these studies ( see Data ). Advise pregnant women of the potential risk to a fetus.
The estimated background risk of major birth defects and miscarriage for the indicated populations are unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.
Clinical Considerations Disease-Associated Maternal and/or Embryo/Fetal Risk Cystic fibrosis may increase the risk for preterm delivery. Data Animal Data No reproductive toxicity studies have been conducted with tobramycin inhalation solution. However, subcutaneous administration of tobramycin at doses of up to 100 (rat) or 20 (rabbit) mg/kg/day during organogenesis was not associated with adverse developmental outcomes.
Subcutaneous doses of tobramycin ≥40 mg/kg/day were severely maternally toxic to rabbits and precluded the evaluation of adverse developmental outcomes. Ototoxicity was not evaluated in offspring during non-clinical reproductive toxicity studies with tobramycin.
8.2Lactation Risk Summary There are no data on the presence of tobramycin inhalation solution in either human or animal milk, the effects on the breastfed infant, or the effects on milk production. Limited published data on other formulations of tobramycin in lactating women indicate that tobramycin is present in human milk. However, systemic absorption of tobramycin following inhaled administration is expected to be minimal [see Clinical Pharmacology ( 12.3 )] .
Tobramycin may cause alteration in the intestinal flora of the breastfeeding infant (see Clinical Considerations ) . The developmental and health benefits of breastfeeding should be considered along with the mother's clinical need for TOBRAMYCIN INHALATION SOLUTION PAK and any potential adverse effects on the breastfed infant from TOBRAMYCIN INHALATION SOLUTION PAK or from the underlying maternal condition. Clinical Considerations Tobramycin may cause intestinal flora alteration.
Advise a woman to monitor the breastfed infant for loose or bloody stools and candidiasis (thrush, diaper rash).
8.4Pediatric Use The safety and efficacy of tobramycin inhalation solution have not been studied in pediatric patients under 6 years of age.
8.5Geriatric Use Clinical studies of tobramycin inhalation solution did not include patients aged 65 years and over. Tobramycin is known to be substantially excreted by the kidney, and the risk of adverse reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, it may be useful to monitor renal function [see Warnings and Precautions ( 5.3 )].
🤰 Pregnancy ▾
8.1Pregnancy Risk Summary Aminoglycosides can cause fetal harm. Published literature reports that use of streptomycin, an aminoglycoside, can cause total, irreversible, bilateral congenital deafness when administered to a pregnant woman [Warnings and Precautions ( 5.5 )] . Although there are no available data on TOBRAMYCIN INHALATION SOLUTION PAK use in pregnant women to inform a drug-associated risk of major birth defects, miscarriage, or adverse maternal or fetal outcomes, systemic absorption of tobramycin following inhaled administration is expected to be minimal [see Clinical Pharmacology ( 12.3 )] .
There are risks to the mother associated with cystic fibrosis in pregnancy (see Clinical Considerations ) . In animal reproduction studies with subcutaneous administration of tobramycin in pregnant rats and rabbits during organogenesis there were no adverse developmental outcomes; however, ototoxicity was not evaluated in the offspring from these studies ( see Data ). Advise pregnant women of the potential risk to a fetus.
The estimated background risk of major birth defects and miscarriage for the indicated populations are unknown. All pregnancies have a background risk of birth defect, loss, or other adverse outcomes. In the U.S. general population, the estimated background risk of major birth defects and miscarriage in clinically recognized pregnancies is 2 to 4% and 15 to 20%, respectively.
Clinical Considerations Disease-Associated Maternal and/or Embryo/Fetal Risk Cystic fibrosis may increase the risk for preterm delivery. Data Animal Data No reproductive toxicity studies have been conducted with tobramycin inhalation solution. However, subcutaneous administration of tobramycin at doses of up to 100 (rat) or 20 (rabbit) mg/kg/day during organogenesis was not associated with adverse developmental outcomes.
Subcutaneous doses of tobramycin ≥40 mg/kg/day were severely maternally toxic to rabbits and precluded the evaluation of adverse developmental outcomes. Ototoxicity was not evaluated in offspring during non-clinical reproductive toxicity studies with tobramycin.
🧒 Pediatric Use ▾
8.4Pediatric Use The safety and efficacy of tobramycin inhalation solution have not been studied in pediatric patients under 6 years of age.
🧓 Geriatric Use ▾
8.5Geriatric Use Clinical studies of tobramycin inhalation solution did not include patients aged 65 years and over. Tobramycin is known to be substantially excreted by the kidney, and the risk of adverse reactions to this drug may be greater in patients with impaired renal function. Because elderly patients are more likely to have decreased renal function, it may be useful to monitor renal function [see Warnings and Precautions ( 5.3 )].
🆘 Overdosage ▾
10 OVERDOSAGE Signs and symptoms of acute toxicity from overdosage of IV tobramycin might include dizziness, tinnitus, vertigo, loss of high-tone hearing acuity, respiratory failure, and neuromuscular blockade. Administration by inhalation results in low systemic bioavailability of tobramycin. Tobramycin is not significantly absorbed following oral administration. Tobramycin serum concentrations may be helpful in monitoring overdosage.
🧬 Clinical Pharmacology ▾
12 CLINICAL PHARMACOLOGY
12.1Mechanism of Action Tobramycin is an aminoglycoside antibacterial [see Microbiology ( 12.4 )].
12.3Pharmacokinetics Absorption Tobramycin inhalation solution contains tobramycin, a cationic polar molecule that does not readily cross epithelial membranes. 1 The bioavailability of tobramycin inhalation solution may vary because of individual differences in nebulizer performance and airway pathology. 2 Following administration of tobramycin inhalation solution, tobramycin remains concentrated primarily in the airways.
Sputum Concentrations Ten minutes after inhalation of the first 300 mg dose of tobramycin inhalation solution, the average concentration of tobramycin was 1237 mcg/g (ranging from 35 to 7414 mcg/g) in sputum. Tobramycin does not accumulate in sputum; after 20 weeks of therapy with the tobramycin inhalation solution regimen, the average concentration of tobramycin at ten minutes after inhalation was 1154 mcg/g (ranging from 39 to 8085 mcg/g) in sputum. High variability of tobramycin concentration in sputum was observed.
Two hours after inhalation, sputum concentrations declined to approximately 14% of tobramycin levels at ten minutes after inhalation. Serum Concentrations The average serum concentration of tobramycin one hour after inhalation of a single 300 mg dose of tobramycin inhalation solution by cystic fibrosis patients was 0.95 mcg/mL. After 20 weeks of therapy on the tobramycin inhalation solution regimen, the average serum tobramycin concentration one hour after dosing was 1.05 mcg/mL.
Distribution Following administration of tobramycin inhalation solution, tobramycin remains concentrated primarily in the airways. Binding of tobramycin to serum proteins is negligible. Elimination Metabolism Tobramycin is not metabolized.
Excretion The elimination half-life of tobramycin from serum is approximately 2 hours after intravenous (IV) administration. Assuming tobramycin absorbed following inhalation behaves similarly to tobramycin following IV administration, systemically absorbed tobramycin is eliminated principally by glomerular filtration. Unabsorbed tobramycin, following tobramycin inhalation solution administration, is likely eliminated primarily in expectorated sputum.
12.4Microbiology Mechanism of Action Tobramycin is an aminoglycoside antibacterial produced by Streptomyces tenebrarius . It acts primarily by disrupting protein synthesis, leading to altered cell membrane permeability, progressive disruption of the cell envelope, and eventual cell death. 3 Tobramycin has in vitro activity against Gram-negative bacteria including P. aeruginosa .
It is bactericidal in vitro at peak concentrations equal to or slightly greater than the minimum inhibitory concentration. Resistance Treatment for 6 months with tobramycin inhalation solution in two clinical studies did not affect the susceptibility of the majority of P. aeruginosa isolates tested; however, increased minimum inhibitory concentrations (MICs) were noted in some patients. The clinical significance of this information has not been clearly established in the treatment of P. aeruginosa in cystic fibrosis patients [see Clinical Studies ( 14 )] .
Susceptibility Testing Interpretive criteria for inhaled antibacterial products are not defined. The in vitro antimicrobial susceptibility test methods used for parenteral tobramycin therapy can be used to monitor the susceptibility of P. aeruginosa isolated from cystic fibrosis patients. 4,5,6 If decreased susceptibility is noted, the results should be reported to the clinician.
Susceptibility breakpoints established for parenteral administration of tobramycin do not apply to aerosolized administration of tobramycin inhalation solution. The relationship between in vitro susceptibility test results and clinical outcome with tobramycin inhalation solution therapy is not clear. A single sputum sample from a cystic fibrosis patient may contain multiple morphotypes of Pseudomonas aeruginos…
🧬 Mechanism of Action ▾
12.1Mechanism of Action Tobramycin is an aminoglycoside antibacterial [see Microbiology ( 12.4 )].
📦 How Supplied / Storage and Handling ▾
16 HOW SUPPLIED / STORAGE AND HANDLING
16.1How Supplied TOBRAMYCIN INHALATION SOLUTION PAK co-packaged kit (NDC 70644-899-99) is available in cartons containing one reusable PARI LC PLUS nebulizer (Model No.: 022B81-T) and 14 tobramycin inhalation solution pouches. Each pouch contains four 300 mg/5 ml ampules of tobramycin inhalation solution for a total of 56 ampules in each carton. Each carton constitutes a 28 day supply.
16.2Storage Tobramycin inhalation solution should be stored under refrigeration at 2-8°C/36-46°F. Upon removal from the refrigerator, or if refrigeration is unavailable, tobramycin inhalation solution pouches (opened or unopened) may be stored at room temperature (up to 25°C/77°F) for up to 28 days. Tobramycin inhalation solution should not be used beyond the expiration date stamped on the ampule when stored under refrigeration (2-8°C/36-46°F) or beyond 28 days when stored at room temperature (25°C/77°F).
Tobramycin inhalation solution ampules should not be exposed to intense light. The solution in the ampule is slightly yellow, but may darken with age if not stored in the refrigerator; however, the color change does not indicate any change in the quality of the product as long as it is stored within the recommended storage conditions.
📦 Storage and Handling ▾
16.2Storage Tobramycin inhalation solution should be stored under refrigeration at 2-8°C/36-46°F. Upon removal from the refrigerator, or if refrigeration is unavailable, tobramycin inhalation solution pouches (opened or unopened) may be stored at room temperature (up to 25°C/77°F) for up to 28 days. Tobramycin inhalation solution should not be used beyond the expiration date stamped on the ampule when stored under refrigeration (2-8°C/36-46°F) or beyond 28 days when stored at room temperature (25°C/77°F).
Tobramycin inhalation solution ampules should not be exposed to intense light. The solution in the ampule is slightly yellow, but may darken with age if not stored in the refrigerator; however, the color change does not indicate any change in the quality of the product as long as it is stored within the recommended storage conditions.
📋 Description ▾
11 DESCRIPTION TOBRAMYCIN INHALATION SOLUTION PAK contains tobramycin inhalation solution, USP and the PARI LC PLUS Reusable Nebulizer (PARI LC PLUS). Tobramycin inhalation solution is a sterile, clear, slightly yellow, non-pyrogenic, aqueous solution with the pH and salinity adjusted specifically for administration by a compressed air driven PARI LC PLUS Reusable Nebulizer. The chemical formula for tobramycin is C 18 H 37 N 5 O 9 and the molecular weight is 467.52.
Tobramycin is O-3-amino-3-deoxy-α-D-glucopyranosyl-(1→4)-O-[2,6-diamino-2,3,6-trideoxy-a-D- ribo - hexopyranosyl-(1→6)]-2-deoxy-L-streptamine. The structural formula for tobramycin is: Each single-use 5 mL ampule contains 300 mg tobramycin and 11.25 mg sodium chloride in sterile water for injection. Sulfuric acid and sodium hydroxide are added to adjust the pH to 6.0.
Nitrogen is used for sparging. The formulation contains no preservatives. The inhalation solution has an osmolality in the range 135 to 200 mOsmol/kg.
The PARI LC PLUS Reusable Nebulizer has the following performance characteristics with tobramycin inhalation solution [measured using Next Generation Impactor (NGI) at 15 L/min continuous flow, standard conditions (50%RH, 23°C)]: (1) Delivered Dose: 174 mg; (2) Fine Particle Dose (< 5μm): 97 mg; (3) Nebulization Time: 13 min.; (4) Mass Median Aerodynamic Diameter: 4.3 μm; (5) Geometric Standard Deviation (GSD): 2.2 μm. Structural Formula for Tobramycin
💬 Information for Patients ▾
17 PATIENT COUNSELING INFORMATION Advise the patient to read the FDA-approved patient labeling ( Patient Information and Instructions for Use ). Instructions for Administration Instruct patients to read the Instructions for Use before starting TOBRAMYCIN INHALATION SOLUTION PAK. Instruct patients to use the tobramycin inhalation solution in TOBRAMYCIN INHALATION SOLUTION PAK only with the PARI LC PLUS Reusable Nebulizer included in the TOBRAMYCIN INHALATION SOLUTION PAK.
Difficulty Breathing Advise patients to inform their physicians if they experience shortness of breath or wheezing after administration of tobramycin inhalation solution. Tobramycin inhalation solution can cause a narrowing of the airway [see Warnings and Precautions ( 5.1 )]. Hearing Loss Advise patients to inform their physician if they experience ringing in the ears, dizziness, or any changes in hearing because tobramycin inhalation solution has been associated with hearing loss [see Warnings and Precautions ( 5.2 )].
Kidney Damage Advise patients to inform their physician if they have any history of kidney problems because tobramycin inhalation solution is in a class of drugs that have caused kidney damage [see Warnings and Precautions ( 5.3 )]. Embryo-Fetal Toxicity: Advise pregnant women that aminoglycosides can cause irreversible congenital deafness when administered to a pregnant woman [see Warnings and Precautions ( 5.5 ) and Use in Specific Populations ( 8.1 )]. Lactation: Advise a woman to monitor their breastfed infants for diarrhea and/or bloody stools [see Use in Specific Populations ( 8.2 )] .
Additional Information PARI LC PLUS ® Reusable Nebulizer: 1-800-327-8632 DeVilbiss ® Pulmo-Aide ® Air Compressor: 1-800-338-1988 TOBRAMYCIN INHALATION SOLUTION PAK: 1-877-236-7239 Manufactured by: Woodstock Sterile Solutions, Inc. Woodstock, IL 60098 Distributed by: Genericus, Inc. Glen Allen, 23060 VA 899D9999 Rev.
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