Tobramycin

What Is Tobramycin?

Tobramycin is an aminoglycoside antibiotic that acts against susceptible bacteria. It is available in different formulations, including ophthalmic preparations used for bacterial infections affecting the external eye.

Tobramycin ophthalmic solution 0.3% contains 3 mg of tobramycin per mL and is intended for topical ophthalmic use. It is indicated for external infections of the eye and its adnexa caused by susceptible bacteria.

Because tobramycin products can differ in formulation and route of administration, patients should use the specific product prescribed for their condition.

How Does Tobramycin Work?

Tobramycin works by interfering with bacterial protein production, which prevents susceptible bacteria from producing proteins required for growth and survival.

As an aminoglycoside antibiotic, tobramycin has activity against a range of susceptible gram-negative and gram-positive organisms. Ophthalmic labeling includes activity against susceptible organisms such as certain Staphylococcus, Streptococcus and Pseudomonas species, among others.

The effectiveness of tobramycin depends on whether the bacteria causing an infection are susceptible to the antibiotic.

Tobramycin for Eye Infections

Tobramycin ophthalmic preparations are used to treat certain external bacterial infections of the eye and its adnexa. The medicine should be used when a bacterial infection is suspected or confirmed to be susceptible to tobramycin.

Eye redness, discharge, swelling and irritation can have many causes, including bacterial, viral and allergic conditions. An antibiotic such as tobramycin is not appropriate for every cause of red or irritated eyes.

Tobramycin and Bacterial Conjunctivitis

Tobramycin may be prescribed for bacterial eye infections when the causative organisms are susceptible to the medicine. However, not every case of conjunctivitis is bacterial.

Viral and allergic conjunctivitis require different management, so antibiotic eye drops should not be used simply because an eye is red or producing discharge.

If symptoms are severe, persistent or associated with significant pain or vision changes, an eye-care professional should evaluate the condition.

Tobramycin for Susceptible Bacteria

Tobramycin has demonstrated activity against several susceptible ophthalmic pathogens. Product labeling describes activity against organisms including Staphylococci, some Streptococci, Pseudomonas aeruginosa, Escherichia coli, Klebsiella pneumoniae, Proteus species and other susceptible bacteria.

Bacterial susceptibility varies, and antibiotic treatment should be selected according to the suspected or confirmed organism and the clinical situation.

Who Should Not Use Tobramycin?

Tobramycin ophthalmic products should not be used by people with a known hypersensitivity to tobramycin or any component of the specific formulation.

Tell your healthcare professional about previous reactions to aminoglycoside antibiotics or other medicines before treatment.

Tobramycin ophthalmic products are intended for topical ophthalmic use and should not be injected into the eye.

Possible Tobramycin Side Effects

Some people may experience local eye irritation or sensitivity after using ophthalmic tobramycin. Hypersensitivity reactions can range from localized redness, itching or rash to more serious allergic reactions. If a sensitivity reaction occurs, the product should be discontinued and appropriate medical advice sought.

If eye pain, swelling, worsening redness, vision changes or another significant reaction develops, contact a healthcare professional promptly.

General Precautions for Safer Use

• Use tobramycin only as prescribed or directed for your specific infection.

• Do not use antibiotic eye drops for an undiagnosed eye problem.

• Do not share eye drops with another person.

• Wash your hands before using ophthalmic medicine.

• Avoid contaminating the dropper tip by touching it to the eye, eyelids or other surfaces.

• Complete the prescribed course unless your healthcare professional tells you otherwise.

• Tell your healthcare professional about allergies to aminoglycoside antibiotics.

• Seek medical advice if symptoms worsen or fail to improve.

• Check the product packaging, expiry date and storage instructions before use.