Drug Class: Aminoglycoside Antibiotic | Form: Sterile Ophthalmic Ointment | Prescription Status: Prescription Only (Rx)
What Is Nebra Eye Ointment?
Nebra Eye Ointment (5g) is a prescription sterile ophthalmic ointment containing Tobramycin 0.3% — a potent aminoglycoside antibiotic used to treat bacterial infections of the external eye and surrounding tissues. Tobramycin works by binding to bacterial ribosomes and permanently blocking protein synthesis — killing susceptible bacteria rather than merely slowing their growth.
Tobramycin has well-established broad-spectrum activity against the gram-positive and gram-negative bacteria most commonly responsible for external eye infections, including Staphylococcus aureus, Streptococcus, Pseudomonas aeruginosa, and Haemophilus influenzae. As an ointment, Nebra maintains prolonged contact with the ocular surface for sustained antibacterial action — making it particularly effective for overnight treatment or when extended antibiotic coverage is required throughout the day.
Nebra must only be used under medical supervision with a valid prescription and confirmed bacterial diagnosis.
What Is Nebra Eye Ointment Used For?
Nebra Eye Ointment is prescribed for bacterial infections of the external eye and surrounding tissues caused by Tobramycin-susceptible organisms, including:
- Bacterial conjunctivitis (آنکھ آنا) — bacterial infection of the conjunctiva causing redness, discharge, and irritation
- Blepharitis — bacterial infection and inflammation of the eyelid margins causing crusting, soreness, and redness
- Styes (انجنی) — infected eyelid glands caused by Staphylococcus aureus
- Dacryocystitis — bacterial infection of the tear duct and surrounding tissue
- Superficial keratitis — mild to moderate bacterial involvement of the corneal surface
- Infected corneal abrasions — treatment and prevention of bacterial infection in corneal wounds or scratches
- External ocular adnexal infections — bacterial infections of the tissues surrounding the eye including the eyelids and periorbital skin
Nebra treats bacterial infections only. It will not treat viral conjunctivitis, fungal eye infections, or allergic eye conditions.
How Does Nebra Eye Ointment Work?
Tobramycin 0.3% — Aminoglycoside Antibiotic: Tobramycin is an aminoglycoside antibiotic that achieves bacterial killing through an irreversible mechanism — making it one of the more potent classes of topical antibiotics available for ophthalmic use. It enters bacterial cells and binds permanently to the 30S ribosomal subunit — the component bacteria use to assemble proteins essential for their survival, growth, and reproduction. Unlike bacteriostatic antibiotics that merely inhibit bacterial growth, Tobramycin's ribosomal binding is irreversible — it causes permanent misreading of the bacterial genetic code, producing abnormal and non-functional proteins that are toxic to the bacterial cell itself, leading to rapid cell death.
Tobramycin's aminoglycoside mechanism is particularly effective against gram-negative bacteria — including Pseudomonas aeruginosa, one of the most aggressive and antibiotic-resistant bacteria capable of causing severe eye infections — as well as many gram-positive organisms. Its bactericidal rather than bacteriostatic action means it actively kills bacteria rather than relying on the immune system to clear them.
Ointment Formulation Advantage: The ointment base ensures Tobramycin remains in contact with the conjunctival surface and eyelid margins for significantly longer than eye drops — which drain rapidly through the nasolacrimal duct. This extended contact time maximises the antibiotic's exposure to bacteria at the infection site and reduces the number of daily applications needed compared to drop formulations.
Dosage and Administration
⚠️ Use exactly as prescribed. Complete the full antibiotic course. Never touch the tube tip to the eye or any surface. Ointment causes temporary blurring after application — do not drive immediately after use.
| Indication | Dose | Frequency | Typical Duration |
|---|---|---|---|
| Mild to moderate bacterial conjunctivitis | Small ribbon (approx. 1cm) | 2 – 3 times daily | 5 – 7 days |
| Blepharitis or stye | 1cm ribbon to eyelid margin | 2 – 3 times daily | 5 – 7 days |
| Severe external eye infection | 1cm ribbon | Every 3 – 4 hours initially — taper as directed | As prescribed |
| Overnight treatment (alongside Tobramycin drops) | 1cm ribbon at bedtime | Once nightly | As prescribed |
How to Apply:
- Wash hands thoroughly before every application
- Tilt head back and look upward
- Gently pull the lower eyelid down to form a small pocket
- Squeeze approximately 1cm ribbon of ointment into the pocket without touching the tube tip to the eye, eyelid, or any surface
- Close the eye gently and roll it to distribute the ointment evenly
- Blot away any excess ointment with a clean tissue
- Replace the cap firmly immediately after use
- Wait until temporary blurring clears before driving or using machinery
Active Ingredients
| Ingredient | Strength | Mechanism |
|---|---|---|
| Tobramycin | 0.3% w/w | Binds irreversibly to bacterial 30S ribosome — blocks protein synthesis, causes rapid bacterial cell death |
Who Should NOT Use Nebra Eye Ointment?
Do not use Nebra if you:
- Are allergic to Tobramycin, any other aminoglycoside antibiotic (Gentamicin, Neomycin, Amikacin), or any ingredient in this product — cross-sensitivity between aminoglycosides is well documented
- Have a viral eye infection — including Herpes simplex keratitis — Nebra has no antiviral activity
- Have a fungal eye infection — antibiotics do not treat fungal infections
- Are wearing soft contact lenses — remove before application and do not wear during treatment
Always consult your doctor before use if you:
- Are pregnant or breastfeeding — use only when benefit clearly outweighs risk as assessed by your doctor
- Are currently using systemic aminoglycoside antibiotics — combined aminoglycoside load requires monitoring
- Have a history of hypersensitivity to aminoglycoside antibiotics
- Are treating a young child — confirm dosing and suitability with your prescribing doctor
Side Effects
Common (mild and temporary):
- Temporary blurring of vision immediately after application — normal with eye ointments, clears within minutes with blinking
- Mild stinging or burning on application
- Temporary foreign body sensation as ointment spreads across the eye surface
- Mild temporary eyelid itching in some users
Serious — Stop Use and Seek Medical Attention Immediately:
- Aminoglycoside hypersensitivity — worsening redness, increasing swelling, or itching after starting treatment rather than gradual improvement may indicate allergic sensitisation — particularly relevant given cross-sensitivity with other aminoglycosides
- Worsening infection despite treatment — if discharge, pain, or redness increases after 48 hours, the causative organism may be resistant or the diagnosis may need reassessment
- Severe allergic reaction — swelling of eyelids or face, widespread rash, difficulty breathing (یہ طبی ہنگامی صورتحال ہے)
- Vision changes beyond expected temporary post-application blurring — seek urgent specialist review
Return to your doctor if symptoms do not begin to improve within 48 hours of starting Nebra.
Drug Interactions
| Medicine / Product | Possible Interaction |
|---|---|
| Systemic aminoglycoside antibiotics | Combined aminoglycoside load — inform your doctor if receiving IV or oral Gentamicin, Amikacin, or other aminoglycosides simultaneously |
| Other eye drops | Apply all eye drops first — wait 5 to 10 minutes before applying Nebra ointment last |
| Tobramycin eye drops | Nebra ointment is commonly prescribed alongside Tobramycin drops — apply drops during the day and ointment at bedtime as directed |
| Soft contact lenses | Do not wear during treatment |
Storage Instructions
- Store below 25°C in a cool, dry place
- Do not refrigerate
- Keep tube tightly capped after every use
- Discard 4 weeks after first opening
- Keep out of reach of children (بچوں کی پہنچ سے دور رکھیں)
- Do not use after the expiry date on the tube or carton
Frequently Asked Questions
What makes Tobramycin different from other antibiotic eye ointments?
Tobramycin's key advantage over many other ophthalmic antibiotics is its bactericidal mechanism — it actively kills bacteria rather than simply slowing their growth. Its irreversible binding to bacterial ribosomes causes bacteria to produce toxic abnormal proteins that destroy the cell from within. This makes Tobramycin particularly effective against aggressive gram-negative organisms like Pseudomonas aeruginosa — a bacteria known for rapid progression and antibiotic resistance that can cause serious corneal damage if not treated promptly with an effective agent. For this reason, Tobramycin is often the antibiotic of choice when Pseudomonas involvement is suspected.
Can I use Nebra Eye Ointment and Tobramycin eye drops at the same time?
Yes — this is a commonly prescribed combination. Tobramycin eye drops are used during waking hours for frequent dosing, while Nebra ointment is applied at bedtime to maintain antibiotic coverage overnight when drops cannot be conveniently administered. The ointment's prolonged contact time makes it ideal for overnight use, ensuring the eye is not left without antibiotic protection during sleep. Always follow your doctor's specific instructions on timing and frequency for both products.
I am allergic to Gentamicin eye drops — can I still use Nebra?
Not without consulting your doctor first. Tobramycin and Gentamicin are both aminoglycoside antibiotics and cross-sensitivity between them is well documented — meaning an allergic reaction to one aminoglycoside significantly increases the risk of reacting to another. If you have a known allergy to Gentamicin, Neomycin, or any other aminoglycoside, inform your doctor before Nebra is prescribed so an alternative antibiotic class can be considered if necessary.
Why does Nebra cause blurry vision and is it safe to drive after use?
Temporary blurring after applying any eye ointment is completely normal and expected. Ointments are thicker than eye drops and create a film over the cornea that temporarily reduces visual clarity until the ointment warms to body temperature and spreads evenly. This typically clears within 2 to 5 minutes with normal blinking. Do not drive or operate machinery until your vision has fully cleared. Many patients find it practical to apply the ointment at bedtime to avoid any inconvenience from temporary blurring during the day.
What should I do if my eye symptoms are not improving after two days of Nebra?
Return to your doctor promptly if there is no noticeable improvement — or if symptoms are worsening — after 48 hours of consistent Nebra use. Lack of improvement may indicate that the causative bacteria are resistant to Tobramycin, that the infection has a viral or fungal component not responsive to antibiotics, or that the original diagnosis requires reassessment. Bacterial culture and sensitivity testing may be recommended to identify the organism and confirm the most effective antibiotic for your specific infection.
⚕️ Medical Disclaimer: This product description is for general informational purposes only and does not replace professional medical advice. Nebra is a prescription medication — always use under the supervision of a qualified doctor or eye specialist. If eye symptoms worsen or do not begin to improve within 48 hours of starting treatment, consult your doctor immediately.
Prescription Required (Rx) | Complete Full Course | Discard 4 Weeks After Opening | Apply Ointment Last Among Multiple Eye Medications