spec sheet4 rows
Tobramycin is an aminoglycoside antibiotic; the 0.3 percent eye drop treats external bacterial eye infection, while the same molecule is inhaled for Pseudomonas in cystic fibrosis and injected for serious Gram negative infection.
- The 0.3 percent eye drop treats external bacterial eye infection
- Bactericidal rather than merely slowing bacteria down
- Inhaled for Pseudomonas in cystic fibrosis
- Injected for serious Gram negative infection
- Negligible systemic exposure from the drop itself
- A workhorse aminoglycoside held in reserve for serious infection
Mechanism
Tobramycin binds the 30S ribosomal subunit essentially irreversibly, causing mistranslation and membrane damage, which makes it bactericidal rather than merely bacteriostatic. Topical ocular use keeps the concentration high at the surface and systemic exposure negligible, so the kidney and cochlear toxicity that limits intravenous use does not apply to the drop.
Safetyrisks and cautions, not medical advice
an aminoglycoside; the systemic forms are nephrotoxic and ototoxic and the class should not be self-directed even when the local formulation is comparatively safe
Subjective profileweighing the evidence above
The drop is fine; the habit around it is the problem. Most red, sticky eyes are viral or allergic, an antibiotic does nothing for either, and reaching for a leftover bottle every time trains resistance in a class held in reserve for serious Gram negative infection. Pain, light sensitivity or blurred vision means something other than simple conjunctivitis and needs an eye looked at rather than a drop guessed at. Worth remembering too that the safety of the ocular form says nothing about the molecule; injected or inhaled, the same drug damages kidneys and hearing.
Where to buy
Suppliers
Vendors carrying Tobramycin, with live product details and codes. Links are affiliate links that support the wiki at no cost to you.
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Tobramycin