(toe bra MYE sin)
- Tobramycin Sulfate
Excipient information presented when available (limited, particularly for generics); consult specific product labeling.
Generic: 10 mg/mL (2 mL); 80 mg/2 mL (2 mL); 1.2 g/30 mL (30 mL); 2 g/50 mL (50 mL)
Generic: 80 mg (100 mL)
Solution Reconstituted, Injection:
Generic: 1.2 g (1 ea)
Solution Reconstituted, Injection [preservative free]:
Generic: 1.2 g (1 ea)
- Antibiotic, Aminoglycoside
Interferes with bacterial protein synthesis by binding to 30S and 50S ribosomal subunits, resulting in a defective bacterial cell membrane
Oral: Poorly absorbed
IM: Rapid and complete
Distributes to extracellular fluid, including serum, abscesses, ascitic, pericardial, pleural, synovial, lymphatic, and peritoneal fluids; poor penetration into CSF, eye, bone, prostate; Vd: Higher in neonates than older pediatric and adult patients; also increased in patients with edema, ascites, fluid overload; decreased in patients with dehydration; Systemic:
Neonates: 0.45 ± 0.1 L/kg
Infants: 0.4 ± 0.1 L/kg
Children: 0.35 ± 0.15 L/kg
Adolescents: 0.3 ± 0.1 L/kg
Adults: 0.2 to 0.3 L/kg
Normal renal function: Urine (~90% to 95%) within 24 hours
Time to Peak
Serum: IM: 30 to 60 minutes; IV: ~30 minutes; Note: Distribution may be prolonged after larger doses. One study reported a 1.7-hour distribution period after a 60-minute, high-dose aminoglycoside infusion (Demczar 1997).
Neonates: ≤1,200 g: 11 hours; >1,200 g: 2 to 9 hours
Infants: 4 ± 1 hour
Children: 2 ± 1 hour
Adolescents: 1.5 ± 1 hour
Adults: IV: 2 to 3 hours; directly dependent upon glomerular filtration rate
Adults with impaired renal function: 5 to 70 hours
Special Populations: Renal Function Impairment
Clearance is decreased in renal impairment.
Use: Labeled Indications
Treatment of documented or suspected infections caused by susceptible gram-negative bacilli, including Pseudomonas aeruginosa.
Hypersensitivity to tobramycin, other aminoglycosides, or any component of the formulation
Note: Individualization is critical because of the low therapeutic index.
In underweight and nonobese patients, use of total body weight (TBW) instead of ideal body weight for determining the initial mg/kg/dose is widely accepted (Nicolau 1995). Ideal body weight (IBW) also may be used to determine doses for patients who are neither underweight nor obese (Gilbert 2009).
Initial and periodic plasma drug levels (eg, peak and trough with conventional dosing, post dose level at a prespecified time with extended-interval dosing) should be determined, particularly in critically-ill patients with serious infections or in disease states known to significantly alter aminoglycoside pharmacokinetics (eg, cystic fibrosis, burns, or major surgery).
Severe life-threatening infections: IM, IV:
Conventional: 1 to 2.5 mg/kg/dose every 8 to 12 hours; to ensure adequate peak concentrations early in therapy, higher initial dosage may be considered in selected patients when extracellular water is increased (edema, septic shock, postsurgical, and/or trauma)
Once-daily: 4 to 7 mg/kg/dose once daily; some clinicians recommend this approach for all patients with normal renal function; this dose is at least as efficacious with similar, if not less, toxicity than conventional dosing.
Brucellosis: IM, IV: 240 mg (IM) daily or 5 mg/kg (IV) daily for 7 days; either regimen recommended in combination with doxycycline
Cholangitis: IM, IV: 4 to 6 mg/kg once daily with ampicillin
CNS shunt infection: Intrathecal (off-label route): 5 to 20 mg/day (Tunkel, 2004)
Diverticulitis, complicated: IM, IV: 1.5 to 2 mg/kg every 8 hours (with ampicillin and metronidazole)
Meningitis (Enterococcus or Pseudomonas aeruginosa): IV: 5 mg/kg/day in divided doses every 8 hours (administered with another bacteriocidal drug)
Pelvic inflammatory disease: IM, IV: Loading dose: 2 mg/kg, then 1.5 mg/kg every 8 hours or 4.5 mg/kg once daily
Plague (Yersinia pestis): IM, IV: Treatment: 5 mg/kg/day, followed by postexposure prophylaxis with doxycycline
Pneumonia, hospital-acquired or ventilator-associated: IV: 5 to 7 mg/kg/day once daily for 7 days; may consider shorter or longer duration depending on rate of clinical improvement. When used as empiric therapy, use in combination with an agent active against S. aureus and an additional antipseudomonal agent. Note: Aminoglycosides are not recommended as monotherapy in patients with hospital-acquired or ventilator-associated pneumonia due to P. aeruginosa (Kalil 2016).
Prophylaxis against endocarditis (dental, oral, upper respiratory procedures, GI/GU procedures): IM, IV: 1.5 mg/kg with ampicillin (50 mg/kg) 30 minutes prior to procedure. Note: AHA guidelines now recommend prophylaxis only in patients undergoing invasive procedures and in whom underlying cardiac conditions may predispose to a higher risk of adverse outcomes should infection occur. As of April 2007, routine prophylaxis no longer recommended by the AHA.
Tularemia: IM, IV: 5 mg/kg/day divided every 8 hours for 1 to 2 weeks
Urinary tract infection: IM, IV: 1.5 mg/kg/dose every 8 hours
Dosage should be based on an estimate of ideal body weight.
IM, IV: 1.5 to 5 mg/kg/day in 1 to 2 divided doses
IV: Once daily or extended interval: 5 to 7 mg/kg/dose given every 24, 36, or 48 hours based on creatinine clearance
Individualization is critical because of the low therapeutic index
Use of ideal body weight (IBW) for determining the mg/kg/dose appears to be more accurate than dosing on the basis of total body weight (TBW).
Usual dosage range: IM, IV:
Infants and Children <5 years: 2.5 mg/kg/dose every 8 hours
Children >5 years: 2 to 2.5 mg/kg/dose every 8 hours
CNS shunt infection: Intrathecal (off-label route): Refer to adult dosing.
Cystic fibrosis: IM, IV: 2.5 to 3.3 mg/kg every 6 to 8 hours. Note: Some patients may require larger or more frequent doses if serum levels document the need (eg, cystic fibrosis or febrile granulocytopenic patients).
Dosing: Renal Impairment
CrCl >60 mL/minute: Administer every 8 hours.
CrCl 40 to 60 mL/minute: Administer every 12 hours.
CrCl 20 to 39 mL/minute: Administer every 24 hours.
CrCl <20 mL/minute: Loading dose, then monitor levels.
High-dose therapy: Interval may be extended (eg, every 48 hours) in patients with moderate renal impairment (CrCl 30 to 59 mL/minute) and/or adjusted based on serum level determinations.
Intermittent hemodialysis (IHD) (administer after hemodialysis on dialysis days) (Heintz 2009): Dialyzable (25% to 70%; variable; dependent on filter, duration, and type of HD): IV:
Loading dose of 2 to 3 mg/kg, followed by:
Mild UTI or synergy: 1 mg/kg/dose every 48 to 72 hours; consider redosing for pre-HD or post-HD serum concentrations <1 mg/L
Moderate to severe UTI: 1 to 1.5 mg/kg/dose every 48 to 72 hours; consider redosing for pre-HD serum concentrations <1.5 to 2 mg/L or post-HD concentrations <1 mg/L
Systemic gram-negative infection: 1.5 to 2 mg/kg/dose every 48 to 72 hours; consider redosing for pre-HD serum concentrations <3 to 5 mg/L or post-HD serum concentrations <2 mg/L
Note: Dosing dependent on the assumption of 3 times/week, complete IHD sessions.
Peritoneal dialysis (PD):
Administration via peritoneal dialysis (PD) fluid:
Gram-negative infection: 4 to 8 mg/L (4 to 8 mcg/mL) of PD fluid
Gram-positive infection (ie, synergy): 3 to 4 mg/L (3 to 4 mcg/mL) of PD fluid
Administration IVPB/IM: Dose as for CrCl <10 mL/minute and follow levels
Continuous renal replacement therapy (CRRT) (Heintz 2009; Trotman 2005): Drug clearance is highly dependent on the method of renal replacement, filter type, and flow rate. Appropriate dosing requires close monitoring of pharmacologic response, signs of adverse reactions due to drug accumulation, as well as target drug concentrations (if appropriate). Note: The following are general recommendations only (based on dialysate flow/ultrafiltration rates of 1 to 2 L/hour and minimal residual renal function) and should not supersede clinical judgment:
Mild UTI or synergy: Loading dose of 2 to 3 mg/kg, followed by 1 mg/kg/dose every 24 to 36 hours (redose when serum concentration <1 mg/L [Heintz 2009])
Moderate-severe UTI: Loading dose of 2 to 3 mg/kg, followed by 1 to 1.5 mg/kg/dose every 24 to 36 hours (redose when serum concentration <1.5 to 2 mg/L [Heintz 2009])
Systemic gram-negative infection: Loading dose of 2 to 3 mg/kg, followed by 1.5 to 2.5 mg/kg/dose every 24 to 48 hours (generally accepted to redose when serum concentration <2 mg/L; one reference suggests redosing when <3 mg/L [Heintz 2009])
Dosing: Hepatic Impairment
No dosage adjustment necessary; does not undergo hepatic metabolism.
In moderate obesity (TBW/IBW ≥1.25) or greater, (eg, morbid obesity [TBW/IBW >2]), initial dosage requirement may be estimated using a dosing weight of IBW + 0.4 (TBW - IBW) (Traynor 1995).
Solution for injection: Dilute in 50-100 mL NS or D5W for IV infusion.
IV: Administer by intermittent infusion over 20 to 60 minutes; higher doses are generally administered over 60 minutes (Aminimanizani 2002; Demsczar 1997). Flush line with saline before and after administration.
May require supplementation of calcium, magnesium, potassium.
See Trissel’s IV Compatibility Database
Stable at room temperature both as the clear, colorless solution and as the dry powder. Reconstituted solutions remain stable for 24 hours at room temperature and 96 hours when refrigerated.
AbobotulinumtoxinA: Aminoglycosides may enhance the neuromuscular-blocking effect of AbobotulinumtoxinA. Monitor therapy
Amphotericin B: May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Arbekacin: May enhance the nephrotoxic effect of Aminoglycosides. Arbekacin may enhance the ototoxic effect of Aminoglycosides. Monitor therapy
BCG (Intravesical): Antibiotics may diminish the therapeutic effect of BCG (Intravesical). Avoid combination
BCG Vaccine (Immunization): Antibiotics may diminish the therapeutic effect of BCG Vaccine (Immunization). Monitor therapy
Bisphosphonate Derivatives: Aminoglycosides may enhance the hypocalcemic effect of Bisphosphonate Derivatives. Monitor therapy
Capreomycin: May enhance the neuromuscular-blocking effect of Aminoglycosides. Monitor therapy
CARBOplatin: Aminoglycosides may enhance the ototoxic effect of CARBOplatin. Especially with higher doses of carboplatin. Monitor therapy
Cefazedone: May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Cephalosporins (2nd Generation): May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Cephalosporins (3rd Generation): May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Cephalosporins (4th Generation): May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Cephalothin: May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Cephradine: May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Cholera Vaccine: Antibiotics may diminish the therapeutic effect of Cholera Vaccine. Avoid combination
CISplatin: May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Colistimethate: Aminoglycosides may enhance the nephrotoxic effect of Colistimethate. Aminoglycosides may enhance the neuromuscular-blocking effect of Colistimethate. Consider therapy modification
CycloSPORINE (Systemic): Aminoglycosides may enhance the nephrotoxic effect of CycloSPORINE (Systemic). Monitor therapy
Distigmine: Aminoglycosides may diminish the therapeutic effect of Distigmine. Monitor therapy
Foscarnet: May enhance the nephrotoxic effect of Aminoglycosides. Avoid combination
Lactobacillus and Estriol: Antibiotics may diminish the therapeutic effect of Lactobacillus and Estriol. Monitor therapy
Loop Diuretics: May enhance the adverse/toxic effect of Aminoglycosides. Specifically, nephrotoxicity and ototoxicity. Monitor therapy
Mannitol (Systemic): May enhance the nephrotoxic effect of Aminoglycosides. Avoid combination
Mecamylamine: Aminoglycosides may enhance the neuromuscular-blocking effect of Mecamylamine. Avoid combination
Methoxyflurane: Aminoglycosides may enhance the nephrotoxic effect of Methoxyflurane. Avoid combination
Neuromuscular-Blocking Agents: Aminoglycosides may enhance the respiratory depressant effect of Neuromuscular-Blocking Agents. Monitor therapy
Nonsteroidal Anti-Inflammatory Agents: May decrease the excretion of Aminoglycosides. Data only in premature infants. Monitor therapy
OnabotulinumtoxinA: Aminoglycosides may enhance the neuromuscular-blocking effect of OnabotulinumtoxinA. Monitor therapy
Oxatomide: May enhance the ototoxic effect of Aminoglycosides. Monitor therapy
Penicillins: May decrease the serum concentration of Aminoglycosides. Primarily associated with extended spectrum penicillins, and patients with renal dysfunction. Exceptions: Amoxicillin; Ampicillin; Cloxacillin; Dicloxacillin; Nafcillin; Oxacillin; Penicillin G (Parenteral/Aqueous); Penicillin G Benzathine; Penicillin G Procaine; Penicillin V Potassium. Consider therapy modification
RimabotulinumtoxinB: Aminoglycosides may enhance the neuromuscular-blocking effect of RimabotulinumtoxinB. Monitor therapy
Sodium Picosulfate: Antibiotics may diminish the therapeutic effect of Sodium Picosulfate. Management: Consider using an alternative product for bowel cleansing prior to a colonoscopy in patients who have recently used or are concurrently using an antibiotic. Consider therapy modification
Tenofovir Products: Aminoglycosides may increase the serum concentration of Tenofovir Products. Tenofovir Products may increase the serum concentration of Aminoglycosides. Monitor therapy
Typhoid Vaccine: Antibiotics may diminish the therapeutic effect of Typhoid Vaccine. Only the live attenuated Ty21a strain is affected. Management: Vaccination with live attenuated typhoid vaccine (Ty21a) should be avoided in patients being treated with systemic antibacterial agents. Use of this vaccine should be postponed until at least 3 days after cessation of antibacterial agents. Consider therapy modification
Vancomycin: May enhance the nephrotoxic effect of Aminoglycosides. Monitor therapy
Some penicillin derivatives may accelerate the degradation of aminoglycosides in vitro, leading to a potential underestimation of aminoglycoside serum concentration.
Frequency not defined.
Central nervous system: Confusion, disorientation, dizziness, headache, lethargy, vertigo
Dermatologic: Exfoliative dermatitis, pruritus, skin rash, urticaria
Endocrine & metabolic: Decreased serum calcium, decreased serum magnesium, decreased serum potassium, decreased serum sodium, increased lactate dehydrogenase, increased nonprotein nitrogen
Gastrointestinal: Diarrhea, nausea, vomiting
Genitourinary: Casts in urine, oliguria, proteinuria
Hematologic & oncologic: Anemia, eosinophilia, granulocytopenia, leukocytosis, leukopenia, thrombocytopenia
Hepatic: Increased serum ALT, increased serum AST, increased serum bilirubin
Local: Pain at injection site
Otic: Auditory ototoxicity, hearing loss, tinnitus, vestibular ototoxicity
Renal: Increased blood urea nitrogen, increased serum creatinine
<1% (Limited to important or life-threatening): Anaphylaxis, clostridium difficile associated diarrhea, erythema multiforme, Stevens-Johnson syndrome, toxic epidermal necrolysis
Concerns related to adverse effects:
• Nephrotoxicity: [US Boxed Warning]: May cause nephrotoxicity; usual risk factors include pre-existing renal impairment, concomitant nephrotoxic medications, advanced age, and dehydration. Discontinue treatment if signs of nephrotoxicity occur; renal damage is usually reversible.
• Neuromuscular blockade and respiratory paralysis: May cause neuromuscular blockade, respiratory failure, and prolonged respiratory paralysis, especially when given soon after anesthesia or muscle relaxants.
• Neurotoxicity: [US Boxed Warning]: May cause neurotoxicity; usual risk factors include pre-existing renal impairment, concomitant neuro-/nephrotoxic medications, advanced age, and dehydration. Ototoxicity is proportional to the amount of drug given and the duration of treatment. Tinnitus or vertigo may be indications of vestibular injury and impending bilateral irreversible damage. Tinnitus and/or hearing loss have also been reported. Discontinue treatment if signs of ototoxicity occur.
• Superinfection: Prolonged use may result in fungal or bacterial superinfection, including C. difficile-associated diarrhea (CDAD) and pseudomembranous colitis; CDAD has been observed >2 months postantibiotic treatment.
• Hearing impairment: Use with caution in patients with pre-existing vertigo, tinnitus, or hearing loss.
• Hypocalcemia: Use with caution in patients with hypocalcemia.
• Neuromuscular disorders: Use with caution in patients with neuromuscular disorders, including myasthenia gravis and Parkinson disease.
• Renal impairment: Use with caution in patients with pre-existing renal insufficiency; dosage modification required during systemic therapy.
Concurrent drug therapy issues:
• Drug-drug interactions: Potentially significant interactions may exist, requiring dose or frequency adjustment, additional monitoring, and/or selection of alternative therapy. Consult drug interactions database for more detailed information.
• Pregnancy: [US Boxed Warnings]: Aminoglycosides may cause fetal harm if administered to a pregnant woman.
Dosage form specific issues:
• Sulfite: Solution for injection may contain sodium metabisulfate; use caution in patients with sulfite allergy.
• Long-term use: Systemic therapy is not intended for long-term therapy due to toxic hazards associated with extended administration.
Urinalysis, urine output, BUN, serum creatinine, peak and trough plasma tobramycin levels. Levels are typically obtained after the third dose in conventional dosing. Be alert to ototoxicity; hearing should be tested before and during treatment
Some penicillin derivatives may accelerate the degradation of aminoglycosides in vitro. This may be clinically-significant for certain penicillin (ticarcillin, piperacillin, carbenicillin) and aminoglycoside (gentamicin, tobramycin) combination therapy in patients with significant renal impairment. Close monitoring of aminoglycoside levels is warranted.
Pregnancy Risk Factor
[US Boxed Warning]: Aminoglycosides may cause fetal harm if administered to a pregnant woman. Tobramycin crosses the placenta. There are several reports of total irreversible bilateral congenital deafness in children whose mothers received another aminoglycoside (streptomycin) during pregnancy. Although serious side effects to the fetus/infant have not been reported following maternal use of all aminoglycosides, a potential for harm exists.
Due to pregnancy-induced physiologic changes, some pharmacokinetic parameters of tobramycin may be altered (Bourget 1991). Tobramycin injection may be used for the management of cystic fibrosis in pregnant patients with Pseudomonas aeruginosa (inhalation is preferred unless risk of infection is great) (Edenborough 2008).
• Discuss specific use of drug and side effects with patient as it relates to treatment. (HCAHPS: During this hospital stay, were you given any medicine that you had not taken before? Before giving you any new medicine, how often did hospital staff tell you what the medicine was for? How often did hospital staff describe possible side effects in a way you could understand?)
• Patient may experience headache, diarrhea, nausea, vomiting, or injection site pain. Have patient report immediately to prescriber signs of kidney problems (urinary retention, hematuria, change in amount of urine passed, or weight gain), change in balance, dizziness, passing out, chills, pharyngitis, muscle weakness, burning or numbness feeling, twitching, tinnitus, hearing impairment, hearing loss, seizures, bruising, bleeding, severe loss of strength and energy, confusion, signs of Clostridium difficile (C. diff)-associated diarrhea (abdominal pain or cramps, severe diarrhea or watery stools, or bloody stools), or signs of Stevens-Johnson syndrome/toxic epidermal necrolysis (red, swollen, blistered, or peeling skin [with or without fever]; red or irritated eyes; or sores in mouth, throat, nose, or eyes) (HCAHPS).
• Educate patient about signs of a significant reaction (eg, wheezing; chest tightness; fever; itching; bad cough; blue skin color; seizures; or swelling of face, lips, tongue, or throat). Note: This is not a comprehensive list of all side effects. Patient should consult prescriber for additional questions.
Intended Use and Disclaimer: Should not be printed and given to patients. This information is intended to serve as a concise initial reference for health care professionals to use when discussing medications with a patient. You must ultimately rely on your own discretion, experience, and judgment in diagnosing, treating, and advising patients.
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