Kloramfenikol Pharmathen (Chloramphenicol Eye Drops)

What Is Kloramfenikol Pharmathen and What Is It Used For?

Kloramfenikol Pharmathen contains chloramphenicol, a broad-spectrum antibiotic that has been used in clinical medicine since the late 1940s. Originally isolated from Streptomyces venezuelae, chloramphenicol was one of the first antibiotics produced synthetically on a large scale. While its systemic use has become restricted due to the rare but serious risk of bone marrow toxicity, topical ophthalmic chloramphenicol remains a mainstay of treatment for bacterial eye infections worldwide.

The medication is specifically indicated for the treatment of acute bacterial conjunctivitis caused by susceptible organisms. Bacterial conjunctivitis is one of the most common eye conditions encountered in primary care, affecting millions of people globally each year. It presents with characteristic symptoms including redness, purulent or mucopurulent discharge, eyelid crusting (particularly upon waking), and a gritty or foreign body sensation in the affected eye. Unlike viral conjunctivitis, which produces a more watery discharge, bacterial conjunctivitis typically produces a thicker, yellowish-green discharge.

Chloramphenicol eye drops are effective against a wide range of organisms commonly responsible for bacterial conjunctivitis, including Staphylococcus aureus, Streptococcus pneumoniae, Haemophilus influenzae, Moraxella catarrhalis, and many Gram-negative bacilli. This broad spectrum of activity makes it an excellent empirical choice for bacterial eye infections before culture and sensitivity results are available. According to the World Health Organization (WHO), chloramphenicol is included on the Model List of Essential Medicines as a key ophthalmic anti-infective agent.

The mechanism of action involves reversible binding to the 50S subunit of the bacterial ribosome, specifically at the peptidyl transferase centre. This prevents the formation of peptide bonds between amino acids during protein synthesis, effectively halting bacterial growth. At the concentrations achieved in the eye with topical application, chloramphenicol is generally bacteriostatic, meaning it stops bacteria from multiplying rather than directly killing them. However, against certain highly susceptible organisms, it may achieve bactericidal concentrations in the conjunctival sac.

After topical application, chloramphenicol demonstrates excellent penetration into ocular tissues. Studies have shown that therapeutic concentrations are achieved in the cornea, aqueous humour, and even the vitreous humour. The lipophilic nature of the drug allows it to cross cell membranes readily, contributing to its effectiveness in treating infections involving deeper ocular structures. Systemic absorption following ophthalmic use is minimal, which substantially reduces the risk of systemic side effects compared with oral or intravenous chloramphenicol administration.

What Should You Know Before Using Kloramfenikol Pharmathen?

Before starting treatment with Kloramfenikol Pharmathen, it is essential to consider several important factors that may affect whether this medication is appropriate for you. While topical chloramphenicol eye drops are generally considered safe when used as directed for short courses, certain conditions and situations warrant special attention or may preclude their use entirely.

Contraindications

Kloramfenikol Pharmathen is contraindicated in patients with a known hypersensitivity to chloramphenicol or to any of the excipients contained in the formulation. Patients who have experienced previous adverse reactions to chloramphenicol, whether administered topically or systemically, should not use this medication. A personal or family history of blood dyscrasias, including aplastic anaemia, is considered a relative contraindication, and the prescribing physician should carefully weigh the benefits against the potential risks in such cases.

The medication should not be used for prophylactic purposes or for trivial infections where simpler measures may suffice. Overuse of antibiotics, even topical ones, contributes to antimicrobial resistance, which is a growing global health concern recognised by the WHO and other international health bodies. Chloramphenicol eye drops are intended for treating confirmed or strongly suspected bacterial infections, not for viral or allergic conjunctivitis, which have different treatment approaches.

Warnings and Precautions

Prolonged or repeated use of chloramphenicol eye drops should be avoided, as this may lead to the overgrowth of non-susceptible organisms, including fungi. If the infection does not improve within 48 hours of starting treatment, or if it worsens at any point, you should consult your doctor promptly. Persistent or worsening symptoms may indicate a resistant organism or a non-bacterial cause of the conjunctivitis that requires a different treatment approach.

The most significant safety concern associated with chloramphenicol, whether used systemically or topically, is the potential for bone marrow suppression. This includes aplastic anaemia, a rare but potentially fatal condition in which the bone marrow fails to produce adequate blood cells. While the risk with short-course topical ophthalmic use is extremely low — estimated by the National Registry of Drug-Induced Ocular Side Effects at approximately 1 in 224,716 to 1 in 3,000,000 treatment courses — patients should be informed of this theoretical possibility. Regular blood monitoring is not routinely recommended for short-course topical use but may be considered in patients using the medication for extended periods.

Patients with hepatic impairment should use chloramphenicol with caution, as the drug is primarily metabolised in the liver. Although systemic absorption from ophthalmic use is minimal, severely impaired liver function could theoretically affect the clearance of any absorbed drug. Similarly, patients with renal impairment should exercise caution, though the relevance of this concern is limited given the low systemic exposure from eye drops.

Pregnancy and Breastfeeding

The use of Kloramfenikol Pharmathen during pregnancy should be considered only when the expected benefit to the mother outweighs any potential risk to the foetus. Chloramphenicol is known to cross the placental barrier when administered systemically. While the systemic absorption from ophthalmic drops is minimal, the precautionary principle applies. The European Medicines Agency (EMA) categorises chloramphenicol as a substance that should be used with caution during pregnancy, particularly during the third trimester.

Chloramphenicol is excreted in breast milk following systemic administration. Although the quantity absorbed systemically from eye drops is negligible, breastfeeding mothers should discuss the risks and benefits with their healthcare provider before using this medication. If prescribed during breastfeeding, applying gentle pressure to the inner corner of the eye (punctal occlusion) after instillation can help minimise systemic absorption further.

How Does Kloramfenikol Pharmathen Interact with Other Drugs?

Because Kloramfenikol Pharmathen is applied topically to the eye with minimal systemic absorption, the potential for drug interactions is considerably lower than with oral or intravenous chloramphenicol. Nevertheless, certain interactions should be considered, particularly with other ophthalmic preparations and in the rare event that significant systemic absorption occurs.

Ophthalmic Interactions

When using multiple eye preparations concurrently, there is the potential for physical incompatibility or dilution of the active ingredients. If you are prescribed more than one type of eye drop, the general recommendation is to wait at least 5 minutes between applying different drops. This interval allows the first preparation to be adequately absorbed and reduces the risk of one medication washing out another. Eye ointments, if used in combination, should generally be applied last, as they form a film over the eye surface that can impede absorption of subsequently applied drops.

Chloramphenicol has been reported to potentially interfere with the efficacy of certain other ophthalmic antibiotics, particularly the bactericidal aminoglycosides and fluoroquinolones. This is because chloramphenicol, as a bacteriostatic agent, can inhibit bacterial growth and thereby reduce the effectiveness of drugs that require actively dividing bacteria to exert their bactericidal effects. For this reason, concurrent use of chloramphenicol with bactericidal ophthalmic antibiotics is generally not recommended unless specifically directed by a specialist ophthalmologist.

Systemic Interactions (Theoretical)

While clinically significant systemic interactions from ophthalmic chloramphenicol are extremely unlikely, it is worth noting the interactions that have been documented with systemic chloramphenicol use. These include potential interactions with warfarin and other anticoagulants (chloramphenicol may enhance anticoagulant effects), phenytoin and other anticonvulsants (chloramphenicol may increase their plasma levels), and certain oral hypoglycaemic agents. In practice, these interactions are of negligible clinical concern with topical ophthalmic use.

What Is the Correct Dosage of Kloramfenikol Pharmathen?

The dosage of Kloramfenikol Pharmathen depends on the severity of the infection and the patient's age. Adhering to the prescribed dosage regimen is crucial for effective treatment and for reducing the risk of antibiotic resistance. It is important to complete the full course of treatment even if symptoms improve before the medication is finished, as premature discontinuation may allow surviving bacteria to multiply and cause a relapse.

Adults

Proper technique for applying eye drops is essential to maximise therapeutic efficacy and minimise contamination. Before application, wash your hands thoroughly with soap and water. Tilt your head back, look upward, and gently pull down the lower eyelid with your index finger to create a small pocket. Hold the dropper above the eye without touching it and squeeze one drop into the pocket. Close your eye gently and apply light pressure to the inner corner of the eye (punctal occlusion) for 1 to 2 minutes. This technique helps prevent the solution from draining through the nasolacrimal duct and increases ocular contact time.

Children

In paediatric patients, administration of eye drops can be challenging. Parents or caregivers may find it helpful to have the child lie down with their eyes closed, place the drop at the inner corner of the eye, and then have the child open their eyes. The drop will flow naturally into the eye. For infants and young children, a second person may be needed to gently hold the child still during administration.

Elderly

Missed Dose

If you forget to apply a dose, apply it as soon as you remember. However, if it is almost time for your next scheduled dose, skip the missed dose and continue with your regular dosing schedule. Do not apply a double dose to make up for a forgotten one. Missing an occasional dose is unlikely to significantly affect the overall treatment outcome, but try to maintain the dosing schedule as consistently as possible for optimal results.

Overdose

Overdose with ophthalmic chloramphenicol is highly unlikely due to the low concentration and the small volume of solution applied per dose. If an excessive amount is accidentally applied to the eye, flush the eye with clean, lukewarm water or sterile saline solution. If the solution is accidentally ingested, the quantity in a single bottle of eye drops is generally too small to cause significant systemic toxicity, but you should contact your local poison control centre or seek medical advice as a precaution. There is no specific antidote for chloramphenicol overdose; treatment is supportive.

What Are the Side Effects of Kloramfenikol Pharmathen?

Like all medications, Kloramfenikol Pharmathen can cause side effects, although not everyone experiences them. The majority of side effects associated with chloramphenicol eye drops are mild and localised to the eye, resolving spontaneously without the need for treatment discontinuation. However, it is important to be aware of both common and rare adverse effects so that you can seek appropriate medical attention if needed.

The risk profile of topical ophthalmic chloramphenicol is fundamentally different from that of systemic chloramphenicol. The serious haematological toxicities that limited the systemic use of chloramphenicol are of theoretical concern with topical use but occur at an exceptionally low frequency. A comprehensive review published in the British Journal of Ophthalmology concluded that the risk of serious systemic side effects from topical chloramphenicol eye drops is extremely low and should not preclude their use when clinically indicated.

The stinging sensation commonly experienced upon application typically lasts only a few seconds to a minute and is attributed to the pH and osmolality of the solution. Blurred vision, if it occurs, usually clears within a few minutes. Patients should avoid driving or operating heavy machinery until their vision has normalised after application. If blurred vision persists, consult your healthcare provider.

Allergic reactions to topical chloramphenicol, while uncommon, may manifest as worsening redness, itching, swelling of the eyelids, or the appearance of a rash around the eyes. If you suspect an allergic reaction, discontinue the medication and consult your doctor. A genuine allergy to chloramphenicol would contraindicate any future use of this antibiotic.

The issue of aplastic anaemia deserves special discussion, as it has historically been the primary concern associated with chloramphenicol use. Aplastic anaemia associated with chloramphenicol is an idiosyncratic reaction, meaning it is unpredictable and not related to the dose. It typically occurs weeks to months after exposure and is distinct from the dose-dependent bone marrow suppression that can occur with systemic use. Several large-scale epidemiological studies have failed to demonstrate a statistically significant association between topical ophthalmic chloramphenicol and aplastic anaemia, leading most authorities to conclude that the risk is negligible with eye drop formulations.

How Should You Store Kloramfenikol Pharmathen?

Proper storage of Kloramfenikol Pharmathen is essential to maintain the stability and efficacy of the medication, as well as to prevent microbial contamination that could potentially introduce new infections into the eye. Chloramphenicol is a relatively stable molecule, but the ophthalmic solution has specific storage requirements that should be followed carefully.

Before opening: Store the unopened bottle in a refrigerator at 2–8°C. Protect from light. Do not freeze the solution, as freezing may affect the physical stability of the formulation. The shelf life of the unopened product is as indicated on the packaging, typically 24 months from the date of manufacture when stored under the recommended conditions.

After opening: Once opened, the eye drops may be stored at room temperature, below 25°C, for a maximum of 28 days. After this period, any remaining solution must be discarded, regardless of how much is left in the bottle. This 28-day limit is a critical safety measure, as the preservative system in the eye drops may not adequately prevent microbial growth beyond this period, and there is an increased risk of contamination with continued use.

Always replace the cap securely after each use. Do not touch the dropper tip with your fingers, the eye, or any other surface, as this can introduce bacteria into the solution. Keep the bottle out of the reach and sight of children. Do not use the eye drops if the solution appears cloudy, discoloured, or contains visible particles, as these may indicate degradation or contamination.

When discarding unused medication, do not pour it down the drain or dispose of it in household waste. Return any unused or expired medication to your pharmacist for safe disposal in accordance with local regulations. Proper disposal of pharmaceuticals helps protect the environment and prevents accidental exposure.

What Does Kloramfenikol Pharmathen Contain?

Understanding the composition of your medication can help you identify potential allergens and understand how the formulation works. Kloramfenikol Pharmathen is a sterile, aqueous ophthalmic solution designed specifically for application to the eye.

Active ingredient: Chloramphenicol 5 mg/ml (0.5% w/v). This is the therapeutically active component responsible for the antibiotic effect. Chloramphenicol has a molecular formula of C₁₁H₁₂Cl₂N₂O₅ and a molecular weight of 323.13 g/mol. It appears as a white to greyish-white crystalline powder that is slightly soluble in water.

Excipients (inactive ingredients): The formulation typically contains boric acid and sodium borate (as buffering agents to maintain the pH of the solution within the optimal range for ocular comfort and drug stability), and purified water as the vehicle. A preservative, commonly phenylmercuric acetate or benzalkonium chloride, is included to maintain sterility of the multi-dose container during the use period. Patients who wear soft contact lenses should be aware that some preservatives can be absorbed by the lens material; however, contact lens wear should be avoided during treatment for an eye infection in any case.

The solution is buffered to a pH close to the natural pH of tears (approximately 7.4) to minimise irritation upon application. The osmolality is adjusted to be approximately isotonic with tears, further reducing the potential for discomfort. The clear, colourless to slightly yellow appearance of the solution is normal; any significant colour change should be reported and the product not used.

References

1. World Health Organization (WHO). WHO Model List of Essential Medicines – 23rd List. Geneva: WHO; 2023. Section 21: Ophthalmological preparations – Anti-infective agents.
2. European Medicines Agency (EMA). Summary of Product Characteristics: Chloramphenicol Eye Drops 0.5%. EMA/CHMP guidelines on ophthalmic anti-infective agents.
3. British National Formulary (BNF). Chloramphenicol. Eye infections, antibacterials. National Institute for Health and Care Excellence (NICE); 2025.
4. Goldstein MH, Kowalski RP, Gordon YJ. Emerging fluoroquinolone resistance in bacterial keratitis: a 5-year review. Ophthalmology. 1999;106(7):1313–1318.
5. Lancaster T, Swart AM, Jick H. Risk of serious haematological toxicity with use of chloramphenicol eye drops in a British general practice database. BMJ. 1998;316(7132):667.
6. Walker S, Diaper CJ, Bowman R, Sweeney G, Seal DV, Kirkness CM. Lack of evidence for systemic toxicity following topical chloramphenicol use. Eye. 1998;12(Pt 5):875–879.
7. Isenberg SJ. The fall and rise of chloramphenicol. J AAPOS. 2003;7(5):307–308.
8. Wiholm BE, Kelly JP, Kaufman D, et al. Relation of aplastic anaemia to use of chloramphenicol eye drops in two international case-control studies. BMJ. 1998;316(7132):666.
9. Rose PW, Harnden A, Brueggemann AB, et al. Chloramphenicol treatment for acute infective conjunctivitis in children in primary care: a randomised double-blind placebo-controlled trial. Lancet. 2005;366(9479):37–43. doi:10.1016/S0140-6736(05)66709-8.
10. Sheikh A, Hurwitz B, van Schayck CP, McLean S, Nurmatov U. Antibiotics versus placebo for acute bacterial conjunctivitis. Cochrane Database Syst Rev. 2012;(9):CD001211. doi:10.1002/14651858.CD001211.pub3.

Editorial Team