Cellufluid: Uses, Dosage & Side Effects
Preservative-free artificial tear eye drops containing carmellose sodium for the relief of dry eye symptoms, available in convenient single-dose units
Cellufluid is a preservative-free artificial tear product containing carmellose sodium (also known as carboxymethylcellulose sodium or CMC). It is used to relieve dry eye symptoms such as grittiness, burning, irritation, and discomfort caused by insufficient natural tear production. Supplied in single-dose units for hygienic one-time use, Cellufluid is safe for contact lens wearers, during pregnancy, and in breastfeeding. This over-the-counter medication is one of the most widely recommended first-line treatments for dry eye disease worldwide.
Quick Facts
Key Takeaways
- Cellufluid contains carmellose sodium 0.5%, a well-established tear substitute that mimics the natural tear film and provides soothing relief for dry, irritated eyes.
- The preservative-free, single-dose format makes Cellufluid safe for contact lens wearers and those sensitive to preservatives like benzalkonium chloride.
- Apply 1–2 drops in the affected eye(s) up to 4 times daily or as needed; each unit-dose container should be used once and then discarded.
- Cellufluid is safe during pregnancy and breastfeeding because the active ingredient is not absorbed into the bloodstream.
- Temporary blurred vision is the most commonly reported side effect — do not drive until your vision has cleared after application.
What Is Cellufluid and What Is It Used For?
Cellufluid belongs to a group of medications known as ophthalmic lubricants or artificial tears. The active ingredient, carmellose sodium (also called carboxymethylcellulose sodium or CMC), is a cellulose-derived polymer that has been used in ophthalmology for decades as a safe and effective tear substitute. When instilled into the eye, carmellose sodium forms a clear, stable lubricating film across the corneal and conjunctival surfaces, mimicking the protective mucin layer of the natural tear film.
Dry eye disease (also referred to as keratoconjunctivitis sicca or dry eye syndrome) is one of the most common ocular conditions worldwide, affecting an estimated 5–50% of the global population depending on the diagnostic criteria and population studied. The condition occurs when the eyes do not produce enough tears or when the tears evaporate too quickly. Risk factors include aging, prolonged screen use, contact lens wear, hormonal changes (particularly in postmenopausal women), certain medications (such as antihistamines, antidepressants, and beta-blockers), autoimmune conditions (such as Sjögren's syndrome and rheumatoid arthritis), and environmental factors like low humidity, air conditioning, and wind exposure.
Cellufluid is specifically designed to address the symptoms of aqueous-deficient dry eye, where the lacrimal glands produce insufficient volume of tears. By supplementing the natural tear film with a viscosity-enhancing polymer, Cellufluid helps to stabilize the tear film, reduce friction between the eyelid and the cornea during blinking, and protect the delicate epithelial cells on the ocular surface from desiccation and mechanical damage. The formulation also contains electrolytes (sodium chloride, potassium chloride, calcium chloride, and magnesium chloride) that closely mimic the ionic composition of natural tears, promoting a healthy ocular surface environment.
One of the key advantages of Cellufluid over many other artificial tear products is its preservative-free formulation. Many conventional multi-dose eye drops contain preservatives such as benzalkonium chloride (BAK), which can cause toxic and allergic reactions on the ocular surface with prolonged use. BAK has been shown to disrupt the tear film lipid layer, increase corneal epithelial cell apoptosis, and exacerbate dry eye symptoms over time. Cellufluid avoids these issues entirely by being packaged in individually sealed, single-dose units (also called unit-dose vials or minims), each containing 0.4 ml of solution.
Cellufluid is also marketed under the brand name Celluvisc in some countries, although Celluvisc typically contains a higher concentration of carmellose sodium (1% or 10 mg/ml) compared to Cellufluid’s 0.5% (5 mg/ml). Both products are manufactured by Allergan (now part of AbbVie) and share the same pharmaceutical quality standards. The lower concentration in Cellufluid makes it well-suited for mild to moderate dry eye symptoms, as it causes less temporary blurring of vision compared to higher-viscosity formulations.
What Should You Know Before Using Cellufluid?
Contraindications
Cellufluid should not be used if you have a known allergy (hypersensitivity) to carmellose sodium or any of the other ingredients in the formulation. The excipients include sodium chloride, sodium lactate, potassium chloride, calcium chloride dihydrate, magnesium chloride hexahydrate, and purified water. Small amounts of sodium hydroxide or hydrochloric acid may also be present as pH adjusters. While true allergic reactions to carmellose sodium are extremely rare, patients who have previously experienced ocular irritation or allergic conjunctivitis after using CMC-based products should consider an alternative artificial tear formulation.
Warnings and Precautions
If you experience increased irritation, pain, redness, or visual disturbances after using Cellufluid, or if your dry eye symptoms worsen rather than improve, discontinue use and consult a healthcare professional or eye care specialist promptly. Persistent or worsening symptoms may indicate an underlying condition requiring different treatment.
While Cellufluid is generally very well tolerated, there are several precautions to be aware of. Do not touch the tip of the single-dose container to your eye, eyelid, fingers, or any other surface, as this may contaminate the solution and potentially cause an eye infection. Always wash your hands thoroughly before handling the unit-dose containers and instilling the drops. Check that each container is intact and unopened before use; do not use the product if the seal appears to have been tampered with.
If you wear contact lenses, you can continue wearing them while using Cellufluid. Unlike many other eye drops that contain benzalkonium chloride or other preservatives that can be absorbed by soft contact lenses and cause irritation, Cellufluid’s preservative-free formulation is compatible with all types of contact lenses, including soft, rigid gas-permeable (RGP), and silicone hydrogel lenses. There is no need to remove your lenses before applying the drops.
Patients using other ophthalmic medications should allow at least 15 minutes between applying other eye drops and Cellufluid. This interval prevents the first drop from being washed out by the second and ensures adequate absorption of each medication. If you are using multiple eye drops, artificial tears like Cellufluid should generally be applied last, as the viscous polymer may interfere with the absorption of other medications if applied first.
Pregnancy and Breastfeeding
Cellufluid is considered safe for use during pregnancy and breastfeeding. Carmellose sodium is a high-molecular-weight polymer that is applied topically to the eye and has negligible systemic absorption. There is no evidence that the active ingredient or excipients cross the placenta or pass into breast milk. This makes Cellufluid a particularly suitable choice for managing dry eye symptoms during pregnancy, when hormonal changes (particularly fluctuations in estrogen and progesterone) can commonly worsen tear film stability and dry eye complaints.
The Tear Film & Ocular Surface Society (TFOS) DEWS II report recognizes pregnancy as a significant risk factor for dry eye disease and recommends preservative-free artificial tears as a first-line treatment option for pregnant and breastfeeding women, as they carry no systemic risk to the mother or child.
Driving and Operating Machinery
Temporary blurred vision may occur immediately after instilling Cellufluid eye drops. If you experience blurred vision, do not drive or operate machinery until your vision has fully cleared. This typically takes only a few minutes but may vary between individuals. Use caution when applying drops before activities that require clear vision.
How Does Cellufluid Interact with Other Drugs?
One of the advantages of Cellufluid is its excellent safety profile when it comes to drug interactions. Since carmellose sodium acts locally on the eye surface and has negligible systemic absorption, there are no known interactions with oral, injectable, or inhaled medications. You can safely use Cellufluid alongside any systemic medications you may be taking, including blood pressure medications, diabetes treatments, antibiotics, hormonal therapies, and immunosuppressants.
However, interactions can occur at the local (ocular) level when multiple eye drops are used together. The viscous nature of carmellose sodium can potentially affect the absorption and efficacy of other topically applied ophthalmic medications. To avoid this, the following timing guidelines should be observed:
| Concomitant Medication | Wait Time | Notes |
|---|---|---|
| Antibiotic eye drops (e.g., chloramphenicol, ofloxacin) | At least 15 minutes | Apply antibiotic drops first, then Cellufluid |
| Anti-inflammatory eye drops (e.g., dexamethasone, ketorolac) | At least 15 minutes | Apply anti-inflammatory drops first, then Cellufluid |
| Glaucoma eye drops (e.g., timolol, latanoprost) | At least 15 minutes | Apply glaucoma drops first; Cellufluid applied last |
| Anti-allergy eye drops (e.g., olopatadine, ketotifen) | At least 15 minutes | Apply allergy drops first, then Cellufluid |
| Cyclosporine eye drops (e.g., Restasis, Ikervis) | At least 15 minutes | Apply cyclosporine first; Cellufluid can soothe any stinging |
| Eye ointments (e.g., lacri-lube, chloramphenicol ointment) | Apply drops before ointment | Ointments form a barrier; always apply last |
The general rule of thumb is to apply medicated eye drops first (those containing active pharmaceutical ingredients for treating specific conditions) and then follow with lubricating drops like Cellufluid. Eye ointments should always be applied last, as their oily base forms a barrier that can prevent subsequent drops from being absorbed.
If you are prescribed multiple eye drop medications, your pharmacist or eye care professional can provide you with a personalized dosing schedule that ensures optimal efficacy for each product while minimizing wash-out effects.
What Is the Correct Dosage of Cellufluid?
Cellufluid is designed for straightforward, self-administered use. The dosage is the same for all patient groups, as carmellose sodium acts locally on the eye surface without systemic absorption. However, individual needs may vary depending on the severity of dry eye symptoms, environmental conditions, and concurrent use of other medications.
Adults
Standard Adult Dosage
Instill 1–2 drops of Cellufluid in the affected eye(s), up to 4 times daily or as needed. The frequency may be increased in situations of increased dryness, such as during prolonged screen use, in air-conditioned environments, or in low-humidity conditions. There is no strict maximum number of applications per day, as Cellufluid is preservative-free and does not accumulate harmful chemicals on the ocular surface.
Children
Pediatric Dosage
Cellufluid can be used in children under the supervision of a parent or caregiver. The dosage is the same as for adults: 1–2 drops in the affected eye(s) as needed. Dry eye is less common in children but may occur in association with prolonged screen time, allergic conjunctivitis, certain medications, or congenital conditions affecting tear production. A pediatric ophthalmologist should evaluate persistent dry eye symptoms in children to rule out underlying causes.
Elderly
Elderly Dosage
No dose adjustment is necessary for elderly patients. Dry eye disease becomes increasingly prevalent with age, particularly in those over 65, due to age-related decline in lacrimal gland function and increased prevalence of conditions such as blepharitis. Elderly patients may benefit from more frequent applications (up to every 2 hours) and should be encouraged to use Cellufluid regularly rather than only when symptoms become bothersome.
How to Apply Cellufluid Eye Drops
Proper application technique is important for maximizing the effectiveness of Cellufluid and minimizing the risk of contamination. Follow these steps carefully:
- Wash your hands thoroughly with soap and water before handling the single-dose containers.
- Separate one single-dose unit from the strip by twisting it off at the perforated seal.
- Hold the unit upright (with the twist-off tab at the top) and twist off the tab to open the container. Do not cut with scissors, as this may create sharp edges.
- Tilt your head back slightly and gently pull down the lower eyelid with a clean finger to create a small pocket between the eyelid and the eye.
- Turn the container upside down and gently squeeze to release 1–2 drops into the pocket formed by the lower eyelid. Avoid touching the tip of the container to your eye, eyelid, or fingers.
- Blink gently several times to spread the solution evenly across the eye surface.
- Discard the opened container immediately after use, even if some solution remains. Do not save or reuse opened containers, as they are no longer sterile once opened.
Missed Dose
If you forget to use Cellufluid at your usual time, simply apply a drop in the affected eye(s) as soon as you remember, then continue with your regular dosing schedule. Do not use a double dose to compensate for a missed application. Because Cellufluid is used for symptom relief rather than to treat an underlying disease process, missing an occasional dose will not cause any harm — you may simply experience a temporary return of dry eye symptoms until the next application.
Overdose
An overdose of Cellufluid eye drops does not pose any significant risk. If you accidentally use too many drops, you may experience temporary excess tearing, mild blurring, or slight discomfort, but these effects will resolve quickly on their own. If the solution is accidentally ingested (for example, by a child), it is unlikely to cause harm, as carmellose sodium is a non-toxic, food-grade polymer widely used in pharmaceutical and food products. However, if you are concerned, contact your local poison control center or healthcare provider for advice.
What Are the Side Effects of Cellufluid?
Like all medicines, Cellufluid can cause side effects, although not everybody experiences them. Cellufluid is generally very well tolerated, particularly because of its preservative-free formulation. Most side effects are mild and transient, resolving within minutes of application. The following side effects have been reported based on post-marketing surveillance and clinical experience:
Common
May affect up to 1 in 10 users
- Eye irritation (including burning sensation and discomfort)
- Eye pain
- Itching of the eyes (ocular pruritus)
- Visual disturbance (temporary blurring of vision after application)
Not Known
Frequency cannot be estimated from available data
- Allergic reactions (including ocular allergy with swelling, redness, or itching)
- Blurred vision (beyond transient blurring)
- Sticky sensation in the eyes
- Watery eyes (excessive lacrimation)
- Red eyes (conjunctival hyperemia)
- Corneal surface damage from contact with the container tip during application
It is important to distinguish between expected transient effects and true adverse reactions. A mild, momentary stinging or burning sensation immediately after instilling the drops is common with many artificial tear products and typically subsides within seconds to a minute. This occurs because the solution is slightly different in pH or osmolality compared to your natural tears. Similarly, brief blurring of vision lasting a few minutes is expected due to the viscous nature of the carmellose sodium solution spreading across the cornea.
However, if you experience persistent pain, increasing redness, significant vision changes, or signs of an allergic reaction (such as swelling of the eyelids, face, or lips, or a rash around the eyes), you should stop using Cellufluid immediately and consult an eye care professional. These reactions are very rare but may indicate a hypersensitivity to one of the ingredients.
To reduce the risk of corneal surface damage, always be careful not to let the tip of the single-dose container touch the eye surface during application. Maintaining a small distance between the tip and the eye will help drops fall gently into the lower eyelid pocket without mechanical contact.
If you experience any side effects, including any not listed above, you can report them to your national pharmacovigilance authority. In the United Kingdom, reports can be made via the Yellow Card Scheme (yellowcard.mhra.gov.uk). In the United States, report to the FDA MedWatch program. In the European Union, report through your national medicines agency. Reporting helps monitor the ongoing safety profile of medicines.
How Should You Store Cellufluid?
Proper storage is essential to maintain the sterility, efficacy, and safety of Cellufluid eye drops. Because the product is preservative-free, each single-dose container is designed for one-time use only, and the storage requirements reflect this design.
- Temperature: Store at or below 25°C (77°F). Do not freeze. Protect from excessive heat and direct sunlight.
- Keep out of sight and reach of children. The small single-dose containers could present a choking hazard for very young children.
- Expiry date: Do not use Cellufluid after the expiry date (marked as “EXP”) printed on the individual containers and outer carton. The expiry date refers to the last day of the stated month.
- Integrity check: Do not use the product if the packaging appears to have been opened or tampered with. Do not use if the solution has changed color or become cloudy.
- After opening: Use the solution immediately after opening the single-dose container. Discard the container and any remaining solution after use. Never store an opened unit-dose container for later use, as it is no longer sterile.
Unused or expired medicines should not be disposed of via household waste or flushed down the drain. Return them to your local pharmacy for safe disposal in accordance with local environmental regulations. Many countries have take-back programs for unused medications to prevent environmental contamination.
What Does Cellufluid Contain?
Understanding the composition of Cellufluid can help you identify potential allergens and appreciate how the formulation has been designed to be as biocompatible with the natural tear film as possible.
| Component | Role | Details |
|---|---|---|
| Carmellose sodium | Active ingredient | 5 mg/ml (0.5%); lubricates and protects the eye surface |
| Sodium chloride | Electrolyte / tonicity agent | Maintains osmolality similar to natural tears |
| Sodium lactate | Buffer | Helps maintain the pH of the solution |
| Potassium chloride | Electrolyte | Mimics natural tear electrolyte balance |
| Calcium chloride dihydrate | Electrolyte | Supports corneal epithelial cell health |
| Magnesium chloride hexahydrate | Electrolyte | Mimics natural tear electrolyte balance |
| Purified water | Solvent | Vehicle for the formulation |
| Sodium hydroxide / Hydrochloric acid | pH adjuster | Small quantities to adjust pH to physiological range |
The electrolyte composition of Cellufluid is specifically formulated to mimic the natural ionic composition of human tears. This balanced electrolyte solution helps maintain corneal epithelial cell health and supports the normal physiological processes of the ocular surface. Calcium and potassium ions, in particular, play important roles in corneal wound healing and maintaining the integrity of the epithelial barrier.
Appearance and Packaging
Cellufluid is a clear, colorless to slightly yellow solution supplied in small, transparent, single-dose polyethylene containers (also called unit-dose vials or minims). Each container holds 0.4 ml of solution and features a twist-off tab for easy opening. The containers are packed in strips and available in cartons containing 5, 30, or 90 single-dose units. Not all pack sizes may be marketed in every country.
The preservative-free, single-dose design eliminates the need for antimicrobial preservatives, which are a common cause of ocular surface toxicity with long-term use. This makes Cellufluid particularly suitable for patients who use artificial tears frequently (more than 4 times per day), those with pre-existing ocular surface disease, contact lens wearers, and patients who have experienced adverse reactions to preserved eye drops.
Frequently Asked Questions About Cellufluid
Cellufluid is an artificial tear eye drop used to relieve the symptoms of dry eyes, including grittiness, burning, irritation, soreness, and dryness. It contains carmellose sodium, a lubricant that supplements your natural tears and helps keep the eye surface moist and protected. It is available over-the-counter and is suitable for long-term use.
Yes. Cellufluid is preservative-free, which means it is safe to use with all types of contact lenses, including soft, rigid gas-permeable, and silicone hydrogel lenses. You do not need to remove your contact lenses before applying the drops. Many preserved eye drops contain benzalkonium chloride, which can be absorbed by soft contact lenses and cause irritation — Cellufluid avoids this issue entirely.
The recommended dosage is 1–2 drops in the affected eye(s) up to 4 times per day, or more often if needed. Because Cellufluid is preservative-free, there is no strict upper limit on how often you can use it. Some patients with severe dry eye may use it every 1–2 hours during waking hours. Each single-dose container should be used once and then discarded.
Yes. Cellufluid is safe during pregnancy and breastfeeding. The active ingredient, carmellose sodium, acts only on the surface of the eye and is not absorbed into the bloodstream. It does not pose any risk to the developing baby or nursing infant. Dry eye is actually very common during pregnancy due to hormonal changes, and Cellufluid is one of the recommended treatments.
Both products contain carmellose sodium and are made by the same manufacturer (Allergan/AbbVie). The key difference is the concentration: Cellufluid contains 0.5% (5 mg/ml) carmellose sodium, while Celluvisc typically contains 1% (10 mg/ml). The higher concentration in Celluvisc provides a thicker, longer-lasting lubricating effect but may cause more temporary blurring of vision. Cellufluid is generally preferred for mild to moderate dry eye, while Celluvisc may be better suited for more severe cases.
No. Cellufluid is a symptomatic treatment that relieves the discomfort of dry eyes but does not address the underlying cause. Dry eye disease can result from many different factors, including aging, hormonal changes, autoimmune conditions, medications, and environmental exposures. For persistent dry eye, a comprehensive evaluation by an ophthalmologist or optometrist is recommended to identify and treat the root cause. Cellufluid can be used as part of a broader treatment plan that may include lifestyle modifications, lid hygiene, anti-inflammatory drops, or other interventions.
References
- Cellufluid Summary of Product Characteristics (SmPC). European Medicines Agency. Last updated 2025.
- Craig JP, Nichols KK, Akpek EK, et al. “TFOS DEWS II Definition and Classification Report.” The Ocular Surface. 2017;15(3):276-283. doi:10.1016/j.jtos.2017.05.008
- Jones L, Downie LE, Korb D, et al. “TFOS DEWS II Management and Therapy Report.” The Ocular Surface. 2017;15(3):575-628. doi:10.1016/j.jtos.2017.05.006
- American Academy of Ophthalmology (AAO). Preferred Practice Pattern: Dry Eye Syndrome. 2023.
- National Institute for Health and Care Excellence (NICE). Clinical Knowledge Summary: Dry Eye Syndrome. Last revised 2024.
- Baudouin C, Labbé A, Liang H, et al. “Preservatives in eyedrops: the good, the bad and the ugly.” Progress in Retinal and Eye Research. 2010;29(4):312-334. doi:10.1016/j.preteyeres.2010.03.001
- World Health Organization (WHO). WHO Model List of Essential Medicines – 23rd List (2023). Ophthalmic preparations section.
- British National Formulary (BNF). Carmellose sodium eye preparations. National Institute for Health and Care Excellence. 2025.
- Gayton JL. “Etiology, prevalence, and treatment of dry eye disease.” Clinical Ophthalmology. 2009;3:405-412. doi:10.2147/opth.s5555
- Pucker AD, Ng SM, Nichols JJ. “Over the counter (OTC) artificial tear drops for dry eye syndrome.” Cochrane Database of Systematic Reviews. 2016;(2):CD009729. doi:10.1002/14651858.CD009729.pub2
Editorial Team
Medical Content Team
Specialist physicians in ophthalmology and clinical pharmacology with extensive experience in ocular surface disease and dry eye management.
Medical Review Board
Independent panel of board-certified ophthalmologists and pharmacologists who verify clinical accuracy against current international guidelines (AAO, TFOS, EMA, NICE).
All content follows the iMedic Editorial Standards and is reviewed according to the GRADE evidence framework. Our editorial process ensures independence from commercial interests, with no pharmaceutical funding or advertising influence.