Cocaine 4-10% (ophthalmic) Eye Drops: Uses, Brands & Dosage

Cocaine 4-10% (ophthalmic) is an eye drop used by ophthalmologists to help confirm a diagnosis of Horner syndrome.

Drug class	Diagnostic Agent
Type	Single
Forms	Eye Drop
Common strength	4% – 10%
Prescription status	Prescription (controlled, clinic use)

What Cocaine 4-10% (ophthalmic) is used for

Cocaine 4-10% (ophthalmic) eye drops are a diagnostic agent used in ophthalmology. This medicine helps doctors confirm certain eye conditions by observing how your pupil reacts. Specifically, it is used for:

Confirming Horner syndrome (this is a traditional test, though newer methods are now more common).

Horner syndrome is a rare condition that affects the nerves connecting your brain to your eye and face. It can cause a smaller pupil, drooping eyelid, and reduced sweating on one side of your face. Cocaine 4-10% (ophthalmic) helps your doctor understand if these symptoms are indeed due to Horner syndrome.

How it works

Cocaine 4-10% (ophthalmic) works by affecting certain chemical messengers in your eye, specifically noradrenaline. Noradrenaline is a natural substance that helps control the size of your pupil. When this eye drop is applied, it blocks the reuptake of noradrenaline.

In a normal eye, where the nerves are functioning correctly, blocking the reuptake of noradrenaline leads to more noradrenaline being available, causing the pupil to dilate (become larger).

However, in an eye affected by Horner syndrome, the nerve pathway that supplies noradrenaline to the pupil is damaged. Because of this damage, there isn’t enough noradrenaline to begin with. So, even if the reuptake is blocked by the cocaine eye drop, there isn’t enough noradrenaline to cause the pupil to dilate significantly. By observing whether the pupil dilates or not after the eye drop is administered, your ophthalmologist can gather important information to help confirm or rule out Horner syndrome.

How it’s used

Cocaine 4-10% (ophthalmic) is a specialized diagnostic medicine that is only administered by a qualified ophthalmologist in a hospital or clinic setting. It is never for self-use at home.

The typical use involves:

Administration: Your doctor will carefully place one drop of the medicine into the affected eye (and sometimes the unaffected eye for comparison).
Observation: After the drop is administered, your doctor will observe your pupil’s reaction over a period of time. They will look for changes in pupil size to help make a diagnosis.

You will not be expected to administer this medicine yourself. The entire process will be managed by the medical staff at Pristine Eye Hospitals, ensuring your comfort and safety.

Always follow your ophthalmologist’s exact instructions.

Brands in India

Hospital-prepared or not marketed as a retail brand in India.

Good to know

Prescription eye medicine — use only as directed by a qualified ophthalmologist. This page is for general education and is not a substitute for professional medical advice, diagnosis or a prescription. Do not self-medicate or reuse an old prescription. This is given only by specialists in a hospital or clinic setting and is never for self-use.

Precautions & side effects

Cocaine 4-10% (ophthalmic) is a controlled substance and requires careful handling and administration by medical professionals. Here are some important precautions:

Controlled Substance: This medicine is a controlled substance, meaning its use is strictly regulated. It is prepared and used only in a hospital or clinic under controlled conditions.
Hospital-Prepared: You will not find this medicine in a regular pharmacy. It is typically prepared within the hospital or clinic setting for immediate use.
Specialist Use Only: This eye drop is exclusively for use by qualified ophthalmologists for diagnostic purposes. It is never for self-medication or home use.
Replaced by Newer Tests: While traditionally used, Cocaine 4-10% (ophthalmic) has largely been replaced by newer, safer diagnostic agents like apraclonidine for confirming Horner syndrome. Your doctor will choose the most appropriate and safest test for your specific situation.
Prescription Only: This is a prescription eye medicine and can only be used as directed by a qualified ophthalmologist.

Your doctor will discuss any specific risks or considerations with you before using this diagnostic agent. Always feel free to ask your ophthalmologist any questions you may have.

Understanding Horner Syndrome and Your Eye Health

Horner syndrome is a relatively rare condition that affects the sympathetic nervous system, which is a part of your body’s automatic control system. This system is responsible for many functions, including controlling the size of your pupils, the opening of your eyelids, and sweating on your face. When the nerve pathway connecting your brain to your eye and face is damaged, it can lead to Horner syndrome. The symptoms typically appear on one side of your face and may include a smaller pupil (miosis), a drooping upper eyelid (ptosis), and sometimes reduced or absent sweating on that side of the face (anhidrosis).

Diagnosing Horner syndrome is important because it can sometimes be a sign of an underlying medical condition that needs attention. Your ophthalmologist will perform a thorough examination and may use specific diagnostic eye drops, like Cocaine 4-10% (ophthalmic), to help confirm the diagnosis. While this particular diagnostic agent has been traditionally used, medical science is always advancing, and your doctor might opt for newer, equally effective, and sometimes safer alternatives like apraclonidine, depending on your specific case. At Pristine Eye Hospitals, we ensure that you receive the most appropriate and up-to-date diagnostic methods for your eye care.

General Advice for Eye Drop Administration and Hygiene

While Cocaine 4-10% (ophthalmic) is administered by medical professionals, it’s always good to understand general best practices for eye drop use, especially if you are prescribed other eye drops for home use. Proper hygiene is crucial to prevent eye infections. Always wash your hands thoroughly with soap and water before touching your eyes or administering any eye drops. Avoid touching the tip of the eye drop bottle to your eye or any other surface, as this can contaminate the medicine. After instilling the drop, gently close your eye for a minute or two to allow the medicine to be absorbed. Do not rub your eyes vigorously.

For any eye drops you use at home, always store them as directed by your doctor or pharmacist, usually in a cool, dry place away from direct sunlight. Check the expiry date and discard any expired medication. Never share your eye drops with anyone else, even if they have similar symptoms, as this can spread infections or lead to inappropriate treatment. If you experience any discomfort, redness, itching, or worsening of your symptoms after using any eye drops, contact your ophthalmologist immediately.

When to Seek Medical Help for Your Eyes

Your eyes are precious, and any changes or concerns should be addressed promptly by an ophthalmologist. If you notice any new symptoms such as sudden vision changes, persistent pain, severe redness, discharge, sensitivity to light, or a sudden drooping of your eyelid or change in pupil size, it is important to seek immediate medical attention. These symptoms could indicate a serious eye condition that requires urgent diagnosis and treatment. Regular eye check-ups are also vital, especially as you age or if you have underlying health conditions like diabetes or high blood pressure, which can affect eye health. At Pristine Eye Hospitals, our team of experienced ophthalmologists is dedicated to providing comprehensive eye care, from routine check-ups to advanced diagnostics and treatments. Remember, this page is for general education and is not a substitute for professional medical advice, diagnosis, or a prescription. Do not self-medicate or reuse an old prescription. Always consult a qualified ophthalmologist for any eye concerns.

Frequently asked questions

What is Cocaine 4-10% (ophthalmic) used for?

Cocaine 4-10% (ophthalmic) is an eye drop used by ophthalmologists as a diagnostic agent to help confirm the diagnosis of Horner syndrome. It helps doctors observe how your pupil reacts to determine if the nerve pathways to your eye are functioning correctly.

How does Cocaine 4-10% (ophthalmic) work?

This eye drop works by blocking the reuptake of noradrenaline, a natural chemical messenger in your eye. In a normal eye, this causes the pupil to dilate. However, in an eye with Horner syndrome, due to nerve damage, there isn't enough noradrenaline to cause significant dilation, which helps the doctor make a diagnosis.

Are there any common Indian brands for Cocaine 4-10% (ophthalmic)?

No, there are no retail brands for Cocaine 4-10% (ophthalmic) available for purchase. It is a controlled substance that is typically prepared within a hospital or clinic setting for immediate diagnostic use by specialists.

How is Cocaine 4-10% (ophthalmic) administered?

Cocaine 4-10% (ophthalmic) is administered by a qualified ophthalmologist in a hospital or clinic. Typically, one drop is placed into the eye, and the doctor then observes the pupil's response to aid in diagnosis. It is never for self-use.

Do I need a prescription for Cocaine 4-10% (ophthalmic)?

Yes, Cocaine 4-10% (ophthalmic) is a prescription eye medicine and a controlled substance. It can only be used as directed by a qualified ophthalmologist and is administered only by specialists in a hospital or clinic setting. It is never for self-use.

What are the key precautions to be aware of with Cocaine 4-10% (ophthalmic)?

Key precautions include that it is a controlled substance, hospital-prepared, and for specialist use only. It has largely been replaced by newer diagnostic agents like apraclonidine. It is never for self-medication and is only used under strict medical supervision in a clinical setting.

References

Medically reviewed by Dr. C Jagadesh Reddy, Chief Surgeon: Cornea, Cataract and Refractive Surgery — last reviewed 2026-07-28.

This page is for general education only and is not a substitute for professional medical advice, diagnosis or treatment. Never self-medicate or reuse an old prescription. Always consult a qualified ophthalmologist before starting, changing or stopping any eye medicine.