Chlorphen5%+1%

Chlorphen is indicated for the topical treatment of acute bacterial infections of the outer ear (otitis externa) caused by susceptible bacteria, particularly when the infection is accompanied by ear pain.

• Established use: Bacterial otitis externa with associated pain/discomfort, where a topical antibiotic combined with a local anesthetic is appropriate.
• Adjunct role: The lidocaine hydrochloride component provides short-term local anesthesia/pain relief while the chloramphenicol component treats the underlying bacterial infection; the two are used together as a combination for this specific purpose rather than as separate/interchangeable indications.
• Not indicated for fungal (mycotic) ear infections, viral infections such as herpes simplex affecting the eye or ear, or in the presence of a perforated eardrum.

A physician or pharmacist should confirm the diagnosis before starting Chlorphen, since ear pain and discharge can also result from conditions this product does not treat.

Chloramphenicol + Lidocaine Hydrochloride is a fixed-dose combination typically formulated as ear drops, commonly available as 5% w/v chloramphenicol with 1% w/v lidocaine hydrochloride.

• Chloramphenicol – a broad-spectrum antibiotic.
• Lidocaine Hydrochloride – an amide-type local anesthetic.

Exact strengths may vary slightly by manufacturer; always check the product label/insert for the specific formulation dispensed.

Chlorphen is a combination otic (ear) preparation that pairs an antibiotic with a local anesthetic. It is formulated to treat the bacterial cause of an outer ear infection while simultaneously easing the associated ear pain.

Chloramphenicol is a broad-spectrum antibacterial agent effective against many Gram-positive and Gram-negative organisms, including several bacteria commonly implicated in otitis externa. Lidocaine hydrochloride is a well-established local anesthetic that provides rapid, short-acting relief of pain and discomfort at the site of application.

Chlorphen is applied directly into the ear canal and is intended for short-term use under medical direction.

Chlorphen belongs to the therapeutic class of otic (ear) preparations combining an antibacterial agent with a local anesthetic, used in otology for infective and painful conditions of the external ear canal.

Chloramphenicol + Lidocaine Hydrochloride combines two agents with distinct mechanisms of action:

• Chloramphenicol binds reversibly to the 50S subunit of the bacterial ribosome, inhibiting peptidyl transferase activity and thereby blocking bacterial protein synthesis. Depending on the organism and concentration, it is bacteriostatic or bactericidal against a broad range of Gram-positive and Gram-negative bacteria.
• Lidocaine Hydrochloride is an amide local anesthetic that stabilizes the neuronal cell membrane by inhibiting the ionic fluxes required for the initiation and conduction of nerve impulses, chiefly by blocking voltage-gated sodium channels. This produces rapid, reversible, localized numbing and pain relief.

When applied topically to the ear, systemic absorption of both components is generally limited, but it is not negligible, particularly with prolonged use, high dose, or when the tympanic membrane is not intact.

Chlorphen is for otic (ear) use only. It must not be taken by mouth, injected, or applied to the eyes.

• Wash hands before and after use.
• Tilt the head with the affected ear upward and instill the prescribed number of drops into the ear canal.
• Keep the head tilted for a minute or two, or insert a small cotton plug if advised, to keep the medication in place.
• Recap the bottle tightly after use and avoid contaminating the dropper tip.

Because Chlorphen is applied topically to the ear canal, clinically significant systemic drug interactions are uncommon compared with oral or injectable forms. However, the following points are clinically relevant:

• Other ototopical or ototoxic agents: Concurrent use of other ear preparations, or systemic ototoxic drugs (e.g., aminoglycoside antibiotics), should be avoided or used with caution due to a theoretical additive risk of local irritation or ototoxicity, especially if the tympanic membrane is not intact.
• Other local anesthetics: Concomitant use of other topical anesthetic products on the same area is not recommended, as it may increase the risk of local anesthetic toxicity.
• Systemic chloramphenicol or other bone-marrow-suppressing drugs: If a patient is separately receiving systemic chloramphenicol or other myelosuppressive medicines, additional caution is warranted; inform the physician of all other medicines in use.

Always inform your physician or pharmacist of all other medicines, including other ear drops, you are using before starting Chlorphen.

Most side effects of Chlorphen are local and mild, but rare serious effects related to the chloramphenicol component have been reported.

• Common/local: Transient burning, stinging, itching, or irritation in the ear canal immediately after application; mild redness of the skin around the ear.
• Hypersensitivity reactions: Allergic contact dermatitis, rash, or urticaria; discontinue and seek medical advice if these occur.
• Ototoxicity: Rarely, hearing disturbances have been reported, more likely with prolonged use or when the eardrum is not intact.
• Blood dyscrasias (rare but serious): Chloramphenicol, mainly with systemic (oral/injectable) use but rarely also reported with topical/otic use, has been associated with serious and sometimes fatal blood disorders, including aplastic anemia and bone marrow suppression. Although systemic absorption from ear drops is low, this class-associated risk means prolonged or repeated topical use should be avoided and any unusual bruising, bleeding, unexplained fatigue, or infection should be reported to a physician immediately.

Data on the topical otic use of Chlorphen during pregnancy and breastfeeding are limited. Because systemic absorption through the ear canal is generally low, risk is expected to be lower than with oral or injectable chloramphenicol, but is not zero, particularly with prolonged use or a non-intact eardrum.

• Pregnancy: Chlorphen should be used during pregnancy only if clearly needed and if the potential benefit justifies the potential risk to the fetus. Consult a physician before use.
• Breastfeeding: Systemic absorption is expected to be minimal with correct topical otic use, but caution is advised. Consult a physician before using Chlorphen while breastfeeding.

Boxed Warning (class-associated risk)

Chloramphenicol, the antibacterial component of Chlorphen, has been associated with serious and fatal blood dyscrasias, including aplastic anemia, primarily reported with systemic (oral/injectable) use. Although topical/otic use results in substantially lower systemic absorption and therefore lower risk, this class-associated risk remains a relevant consideration, especially with prolonged or repeated courses.

Other Precautions

• Use Chlorphen for the shortest duration necessary as directed by a physician; avoid prolonged or repeated use without medical reassessment.
• Do not use if the eardrum is known or suspected to be perforated unless specifically directed by a physician (see Contraindications).
• Discontinue and seek medical care if ear pain worsens, new symptoms (such as fever, spreading redness, or drainage) develop, or if there is no improvement within a few days.
• Avoid contact with the eyes; if accidental eye contact occurs, rinse thoroughly with water.
• Not intended for long-term or prophylactic use.
• Use with caution in patients with a personal or family history of blood disorders (see Side Effects and Contraindications).

Deliberate or accidental ingestion of Chlorphen, or gross overuse in the ear, is unlikely with normal otic use but should be treated seriously if it occurs. Possible effects could include local irritation, dizziness, or, with significant systemic absorption, signs of lidocaine toxicity (such as numbness, tinnitus, confusion, or in severe cases seizures or cardiac effects) or, with chronic excessive use, chloramphenicol-related blood effects.

If overdose or accidental ingestion is suspected, seek immediate medical attention or contact a poison control center/emergency services. Do not attempt to manage a suspected overdose at home without professional guidance.

Store at room temperature (below 30°C), away from light and moisture. Do not freeze. Keep the bottle tightly closed when not in use, and discard any remaining product after the period stated on the label once opened. Keep out of reach of children.

• Pediatric use: Chlorphen may be used in children as directed by a physician; use in infants should only occur when considered essential by a physician, given the theoretical risk associated with the chloramphenicol component. Safety and efficacy in neonates have not been well established.
• Elderly: No specific dose adjustment is generally required for otic use in elderly patients; standard adult dosing applies unless otherwise directed.
• Renal/hepatic impairment: Systemic absorption from topical otic use is low, so specific dose adjustment is not typically required; however, caution is advised with prolonged use, and a physician should be consulted.
• Perforated eardrum: See Contraindications — use only if specifically directed by a physician, as absorption and risk may differ when the eardrum is not intact.

Chlorphen is generally used for the shortest effective duration, typically up to 7 days, unless a physician directs a different course. Prolonged or repeated use without medical reassessment should be avoided because of the chloramphenicol-associated blood dyscrasia risk. If symptoms persist beyond a week or worsen at any point, stop use and consult a physician.

Chloramphenicol + Lidocaine Hydrochloride is classified as an otic antibacterial–local anesthetic combination, combining a broad-spectrum antibiotic (chloramphenicol) with an amide-type local anesthetic (lidocaine hydrochloride).

Chloramphenicol + Lidocaine Hydrochloride acts through two complementary mechanisms: chloramphenicol inhibits bacterial protein synthesis by binding to the 50S ribosomal subunit, exerting bacteriostatic or bactericidal activity against susceptible organisms; lidocaine hydrochloride blocks voltage-gated sodium channels in nerve membranes, preventing nerve impulse conduction and producing local anesthesia and pain relief at the site of application.

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Chlorphen can be used in children under medical supervision for bacterial otitis externa with pain, following the dose and frequency directed by a physician. In infants, it should be used only when a physician judges it essential, considering the class-associated risk linked to the chloramphenicol component. Safety and efficacy have not been well established in neonates, and this age group should only receive Chlorphen under close medical supervision if a physician determines it is necessary.