Gentamicin 0.3% Ophth Solution
It is used to treat eye infections.
Drug Class
Ophthalmic Anti-infective
Pharmacologic Class
Aminoglycoside Antibiotic
Pregnancy Category
C
FDA Approved
Jun 1971
DEA Schedule
Not Controlled
Overview
What is this medicine?
Gentamicin eye drops are an antibiotic medication used to treat bacterial infections of the eye. It works by stopping the growth of bacteria that cause the infection.
How to Use This Medicine
Proper Use of This Medication
To use this medication correctly, follow your doctor's instructions and read all the information provided. Use the medication as directed, even if your symptoms improve.
Administration Instructions
1. Use this medication for the eye only.
2. Wash your hands before and after use to maintain cleanliness.
3. Avoid touching the container tip to your eye, eyelid, or other skin to prevent bacterial contamination, which can lead to severe eye problems or vision loss.
4. Tilt your head back and gently drop the medication into your eye.
5. After administering the medication, keep your eyes closed and apply pressure to the inside corner of your eye for 1 to 2 minutes to help the medication stay in your eye.
Storage and Disposal
Store this medication at room temperature, protected from heat. Keep all medications in a safe location, out of the reach of children and pets.
Missed Dose Instructions
If you miss a dose, use it as soon as you remember. However, if it is close to the time for your next dose, skip the missed dose and resume your regular dosing schedule. Do not use two doses at the same time or take extra doses.
To use this medication correctly, follow your doctor's instructions and read all the information provided. Use the medication as directed, even if your symptoms improve.
Administration Instructions
1. Use this medication for the eye only.
2. Wash your hands before and after use to maintain cleanliness.
3. Avoid touching the container tip to your eye, eyelid, or other skin to prevent bacterial contamination, which can lead to severe eye problems or vision loss.
4. Tilt your head back and gently drop the medication into your eye.
5. After administering the medication, keep your eyes closed and apply pressure to the inside corner of your eye for 1 to 2 minutes to help the medication stay in your eye.
Storage and Disposal
Store this medication at room temperature, protected from heat. Keep all medications in a safe location, out of the reach of children and pets.
Missed Dose Instructions
If you miss a dose, use it as soon as you remember. However, if it is close to the time for your next dose, skip the missed dose and resume your regular dosing schedule. Do not use two doses at the same time or take extra doses.
Lifestyle & Tips
- Wash hands thoroughly before and after applying eye drops.
- Do not touch the dropper tip to the eye or any other surface to avoid contamination.
- Remove contact lenses before applying drops and wait at least 15 minutes before reinserting them, unless otherwise directed by your doctor.
- Do not share eye drops with others.
- Complete the full course of treatment, even if symptoms improve, to prevent recurrence and development of resistance.
- Avoid rubbing the infected eye.
Available Forms & Alternatives
Available Strengths:
- Gentamicin 0.3% Ophth Soln 5ml
- Gentamicin 0.3% Ophth Solution
- Gentamicin 40mg/ml Inj, 2ml
- Gentamicin 0.1% Cream 15gm
- Gentamicin 40mg/ml Inj, 20ml
- Gentamicin 0.1% Cream 30gm
- Gentamicin Pf Ped 10mg/ml Inj, 2ml
- Gentamicin 0.1% Oint 15gm (topical)
- Gentamicin 0.1% Oint 30gm (topical)
- Gentamicin 80mg/ml Inj, 2ml
Dosing & Administration
Adult Dosing
Standard Dose:
Instill 1-2 drops into the affected eye(s) every 4 hours. For severe infections, dosage may be increased to up to 2 drops every hour.
Dose Range:
1 - 2 mg
Condition-Specific Dosing:
severe_infection:
2 drops every hour
Pediatric Dosing
Neonatal:
Not established (use with caution, consult specialist)
Infant:
Instill 1-2 drops into the affected eye(s) every 4 hours.
Child:
Instill 1-2 drops into the affected eye(s) every 4 hours.
Adolescent:
Instill 1-2 drops into the affected eye(s) every 4 hours.
Dose Adjustments
Renal Impairment:
Mild:
No adjustment needed (minimal systemic absorption)
Moderate:
No adjustment needed (minimal systemic absorption)
Severe:
No adjustment needed (minimal systemic absorption)
Dialysis:
No specific considerations (minimal systemic absorption)
Hepatic Impairment:
Mild:
No adjustment needed (minimal systemic absorption)
Moderate:
No adjustment needed (minimal systemic absorption)
Severe:
No adjustment needed (minimal systemic absorption)
Pharmacology
Mechanism of Action
Gentamicin is an aminoglycoside antibiotic that inhibits bacterial protein synthesis by binding to the 30S ribosomal subunit, leading to misreading of the mRNA template and premature termination of protein synthesis. This results in the production of non-functional proteins and disruption of bacterial cell membrane integrity, ultimately leading to bacterial cell death.
Pharmacokinetics
Absorption:
Bioavailability:
Negligible systemic absorption from ophthalmic administration
Tmax:
Not applicable (local action)
FoodEffect:
Not applicable
Distribution:
Vd:
Not applicable (minimal systemic distribution)
ProteinBinding:
Not applicable (minimal systemic absorption)
CnssPenetration:
No (minimal systemic absorption)
Elimination:
HalfLife:
Not applicable (minimal systemic absorption)
Clearance:
Not applicable (minimal systemic absorption)
ExcretionRoute:
Primarily local elimination; minimal systemic excretion via kidneys if absorbed
Unchanged:
Not applicable (minimal systemic absorption)
Pharmacodynamics
OnsetOfAction:
Within hours (clinical improvement typically seen within 2-3 days)
PeakEffect:
Not precisely quantifiable for local ophthalmic effect
DurationOfAction:
Approximately 4 hours (based on dosing frequency)
Confidence:
Medium
Safety & Warnings
Side Effects
Urgent Side Effects: Seek Medical Help Right Away
While rare, some people may experience severe and potentially life-threatening side effects when taking this medication. If you notice any of the following symptoms, contact your doctor or seek immediate medical attention:
Signs of an allergic reaction, such as:
+ Rash
+ Hives
+ Itching
+ Red, swollen, blistered, or peeling skin with or without fever
+ Wheezing
+ Tightness in the chest or throat
+ Trouble breathing, swallowing, or talking
+ Unusual hoarseness
+ Swelling of the mouth, face, lips, tongue, or throat
Changes in eyesight
Eye pain
Eye irritation
Other Possible Side Effects
Like all medications, this drug can cause side effects. Although many people may not experience any side effects or only minor ones, it's essential to discuss any concerns with your doctor. If you experience any of the following side effects or any other unusual symptoms that bother you or persist, contact your doctor for guidance:
* Burning
Reporting Side Effects
This list is not exhaustive, and you may experience other side effects not mentioned here. If you have questions or concerns about side effects, don't hesitate to reach out to your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
While rare, some people may experience severe and potentially life-threatening side effects when taking this medication. If you notice any of the following symptoms, contact your doctor or seek immediate medical attention:
Signs of an allergic reaction, such as:
+ Rash
+ Hives
+ Itching
+ Red, swollen, blistered, or peeling skin with or without fever
+ Wheezing
+ Tightness in the chest or throat
+ Trouble breathing, swallowing, or talking
+ Unusual hoarseness
+ Swelling of the mouth, face, lips, tongue, or throat
Changes in eyesight
Eye pain
Eye irritation
Other Possible Side Effects
Like all medications, this drug can cause side effects. Although many people may not experience any side effects or only minor ones, it's essential to discuss any concerns with your doctor. If you experience any of the following side effects or any other unusual symptoms that bother you or persist, contact your doctor for guidance:
* Burning
Reporting Side Effects
This list is not exhaustive, and you may experience other side effects not mentioned here. If you have questions or concerns about side effects, don't hesitate to reach out to your doctor. You can also report side effects to the FDA at 1-800-332-1088 or online at https://www.fda.gov/medwatch.
Seek Immediate Medical Attention If You Experience:
- Worsening eye pain or discomfort
- Increased redness, swelling, or discharge
- New or worsening vision changes
- Signs of an allergic reaction (e.g., rash, severe itching, swelling of face/tongue/throat, severe dizziness, trouble breathing)
- No improvement in symptoms after 2-3 days of use
Before Using This Medicine
Before Taking This Medication: Important Information to Share with Your Doctor
It is essential to inform your doctor about the following:
Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Be sure to describe the symptoms you experienced as a result of the allergy.
All medications you are currently taking, including prescription and over-the-counter (OTC) drugs, natural products, and vitamins. This information will help your doctor and pharmacist identify potential interactions between this medication and other substances you are taking.
* Any health problems you have, as this medication may interact with certain conditions.
To ensure your safety, it is crucial to verify that it is safe to take this medication with all your other medications and health conditions. Always consult your doctor before starting, stopping, or changing the dose of any medication.
It is essential to inform your doctor about the following:
Any allergies you have, including allergies to this medication, its components, or other substances, such as foods or drugs. Be sure to describe the symptoms you experienced as a result of the allergy.
All medications you are currently taking, including prescription and over-the-counter (OTC) drugs, natural products, and vitamins. This information will help your doctor and pharmacist identify potential interactions between this medication and other substances you are taking.
* Any health problems you have, as this medication may interact with certain conditions.
To ensure your safety, it is crucial to verify that it is safe to take this medication with all your other medications and health conditions. Always consult your doctor before starting, stopping, or changing the dose of any medication.
Precautions & Cautions
It is essential to inform all your healthcare providers, including doctors, nurses, pharmacists, and dentists, that you are taking this medication. When taking this drug, exercise caution when driving or performing tasks that require clear vision to ensure your safety. Do not exceed the prescribed duration of use, as this may increase the risk of a secondary infection. If you are pregnant, planning to become pregnant, or are breastfeeding, consult your doctor to discuss the potential benefits and risks of this medication to both you and your baby.
Overdose Information
Overdose Symptoms:
- Unlikely with ophthalmic use due to minimal systemic absorption. Local irritation may occur with excessive use.
What to Do:
If excessive local irritation occurs, rinse eye with lukewarm water. If accidentally ingested, seek medical attention, but systemic toxicity is highly unlikely due to poor oral absorption. Call 1-800-222-1222 for Poison Control.
Drug Interactions
Monitoring
Baseline Monitoring
Ocular examination (visual acuity, conjunctival injection, discharge, corneal integrity)
Rationale: To assess the severity and nature of the ocular infection and establish a baseline for treatment efficacy.
Timing: Prior to initiation of therapy
Routine Monitoring
Clinical response (reduction in signs/symptoms of infection)
Frequency: Daily or as clinically indicated
Target: Resolution of infection
Action Threshold: Lack of improvement or worsening symptoms after 2-3 days may indicate resistant organism or alternative diagnosis.
Signs of local irritation or hypersensitivity (redness, itching, swelling)
Frequency: Daily
Target: Absence of irritation
Action Threshold: Discontinue if severe irritation or allergic reaction occurs.
Symptom Monitoring
- Increased eye pain
- Worsening redness or swelling of the eye
- Increased discharge from the eye
- Blurred vision or vision changes
- Itching or burning sensation in the eye
- Sensitivity to light
Special Patient Groups
Pregnancy
Category C. While systemic aminoglycosides are associated with fetal ototoxicity, the systemic absorption of ophthalmic gentamicin is minimal. Use during pregnancy only if the potential benefit justifies the potential risk to the fetus.
Trimester-Specific Risks:
First Trimester:
Low risk due to minimal systemic absorption, but caution advised.
Second Trimester:
Low risk due to minimal systemic absorption, but caution advised.
Third Trimester:
Low risk due to minimal systemic absorption, but caution advised.
Lactation
L3 (Moderately Safe). Systemic absorption is minimal, making infant exposure via breast milk unlikely to be significant. Caution is advised, and monitor infant for potential adverse effects (e.g., diarrhea, thrush), though highly improbable.
Infant Risk:
Low
Pediatric Use
Generally considered safe and effective for pediatric use, including infants, for appropriate indications. Dosing is typically similar to adults. Neonatal use should be under specialist guidance due to potential for increased systemic absorption in premature infants or those with compromised ocular surfaces.
Geriatric Use
No specific dosage adjustments are necessary for geriatric patients. The safety and efficacy profile is similar to that in younger adults, given the minimal systemic absorption.
Clinical Information
Clinical Pearls
- Advise patients to avoid wearing contact lenses during treatment for bacterial conjunctivitis or keratitis.
- If using multiple ophthalmic medications, instruct patients to wait at least 5-10 minutes between drops to prevent wash-out.
- Emphasize proper instillation technique to maximize drug delivery and minimize contamination.
- Prolonged use of topical antibiotics may lead to overgrowth of non-susceptible organisms, including fungi. Re-evaluate if infection worsens or persists.
- Topical aminoglycosides can cause local hypersensitivity reactions; discontinue if irritation or allergic symptoms occur.
Alternative Therapies
- Tobramycin ophthalmic solution
- Moxifloxacin ophthalmic solution
- Gatifloxacin ophthalmic solution
- Ofloxacin ophthalmic solution
- Ciprofloxacin ophthalmic solution
- Erythromycin ophthalmic ointment
- Polymyxin B/Trimethoprim ophthalmic solution
Cost & Coverage
Average Cost:
Varies widely, typically $10-$50 per 5mL or 15mL bottle
Generic Available:
Yes
Insurance Coverage:
Tier 1 or 2 (Generic)
General Drug Facts
If your symptoms or health issues persist or worsen, it's essential to contact your doctor for further guidance. To ensure your safety, never share your medication with others or take someone else's medication. Some medications may come with an additional patient information leaflet, so be sure to check with your pharmacist for more information. If you have any questions or concerns about this medication, don't hesitate to reach out to your doctor, nurse, pharmacist, or other healthcare provider. In the event of a suspected overdose, immediately call your local poison control center or seek medical attention. When seeking help, be prepared to provide details about the overdose, including the medication taken, the amount, and the time it occurred.