Odyral (Eye Drops, Solution)
Prescription Ophthalmic Solution — Single-Dose Container
Quick Facts About Odyral
Key Takeaways About Odyral
- Prescription-only ophthalmic medicine: Odyral 20 mg/ml is a prescription eye drop supplied in sterile single-dose containers and must only be used under the supervision of an ophthalmologist or other authorised prescriber
- Single-dose, preservative-free design: Each single-dose container is intended for one application only — discard immediately after use, even if solution remains, to maintain sterility and minimise ocular surface irritation
- Correct technique matters: Proper instillation (clean hands, no tip contact, one drop in the lower eyelid pocket, gentle eye closure, brief punctal occlusion) improves efficacy and reduces systemic absorption
- Side effects are usually local and transient: Mild stinging, blurred vision, redness, or foreign-body sensation just after instillation are common for many ophthalmic drops and typically settle within minutes
- Always follow the prescribing physician's instructions: Dose frequency, treatment duration, combination with other eye drops, and monitoring requirements are individualised — do not change or stop treatment without medical advice
What Is Odyral and What Is It Used For?
Odyral is a prescription ophthalmic solution supplied as 20 mg/ml (2%) in sterile single-dose containers for topical application to the eye. It is prescribed by ophthalmologists for specific ocular conditions in accordance with the approved product information; your prescribing physician will explain the exact indication in your individual case.
Odyral belongs to the broad category of topical ophthalmic preparations — medicines formulated as sterile aqueous solutions that are instilled directly onto the surface of the eye. Ophthalmic drops are one of the most commonly prescribed drug-delivery formats in eye care because they deliver the medicine where it is needed, achieve high local concentrations at the ocular surface and anterior segment, and minimise systemic exposure when compared with oral or intravenous administration.
Because Odyral is classified as a prescription-only medicine (Rx), it is not available for self-selection from pharmacy shelves. A qualified prescriber — typically an ophthalmologist, optometrist with prescribing rights, or general medical practitioner — must first assess your eye, make a diagnosis and decide whether Odyral is an appropriate treatment for you. Prescription control exists because the medicine is intended for specific medical conditions that need a professional diagnosis and because incorrect use may delay appropriate care or cause harm.
The 20 mg/ml strength (equivalent to 2%) is a concentration used for several ophthalmic active substances and is chosen to deliver a therapeutic dose in the small volume of fluid that the eye can comfortably hold (the lower conjunctival sac accommodates roughly 25–30 microlitres, which is why only one drop is needed at each administration — the excess simply overflows or is cleared by the tear drainage system).
Why single-dose containers?
Odyral is supplied in single-dose containers rather than multi-dose bottles. This is a deliberate pharmaceutical choice with several advantages:
- Preservative-free: Multi-dose eye drop bottles usually contain preservatives such as benzalkonium chloride to prevent microbial growth once opened. Preservatives can, over time, damage the delicate cells of the cornea and conjunctiva, particularly in patients using drops chronically. Single-dose units are preservative-free because each unit is used only once and then discarded, so there is no need to guard against bacterial contamination during storage after opening.
- Reduced toxicity to the ocular surface: For patients with dry eye, ocular surface disease, or those on long-term topical therapy, the cumulative impact of preservatives can worsen symptoms. Preservative-free formats are preferred by many ophthalmologists for this group.
- Sterility guarantee: Each single-dose container is filled aseptically and sealed; once opened it is used immediately, so the risk of introducing micro-organisms into the eye is minimised.
- Accurate dosing: A single-dose container is calibrated to deliver a controlled volume, which is helpful for patients who find multi-dose droppers difficult to use.
General role of prescription eye drops in ophthalmology
Across the world, ophthalmologists prescribe topical eye preparations for a wide spectrum of conditions. Broad categories include anti-inflammatory agents for uveitis and postoperative inflammation; anti-infectives for bacterial, viral and fungal keratitis; pressure-lowering medications for glaucoma and ocular hypertension; anti-allergic and mast-cell-stabilising agents for ocular allergy; immunomodulators for severe dry eye and vernal keratoconjunctivitis; and lubricating or protective agents for corneal surface disease. Prescription-only ophthalmic solutions in single-dose format are most often used when long-term therapy is anticipated or when the ocular surface is already compromised.
Because Odyral's marketing authorisation and approved indication may vary by country, the most reliable source of information about the specific clinical use of Odyral in your case is the official patient information leaflet (PIL) supplied with the product and the advice of your prescribing ophthalmologist.
The information on this page is general educational content about prescription ophthalmic solutions such as Odyral. It does not replace the product's official patient information leaflet or the advice of your healthcare provider. Always read the leaflet supplied with your specific product and follow your prescribing physician's instructions, as these may differ from general guidance.
What Should You Know Before Using Odyral?
Before using Odyral, tell your prescribing physician about all eye conditions, previous eye surgery, contact lens use, other eye drops, systemic medicines, allergies, pregnancy or breastfeeding. Never share prescription eye drops, and do not use Odyral if you develop signs of an allergic reaction or if the container is damaged or the solution is discoloured.
Prescription ophthalmic medicines are powerful treatments that can be extremely effective when used in the right patient and context, but they also require careful assessment before starting. Your ophthalmologist will take a detailed medical and ocular history before issuing a prescription for Odyral. Honest and complete disclosure of your medical background is essential to ensure the medication is suitable and safe for you.
Contraindications
Like all prescription medicines, Odyral has situations in which it must not be used. These contraindications are listed in the approved product information. In general, prescription eye drops must not be used in the following circumstances:
- Hypersensitivity (allergy) to the active ingredient or any of the excipients in the formulation — reactions can range from mild eyelid irritation to serious anaphylaxis
- Known allergy to a class of related compounds identified in the product labelling
- Any additional product-specific contraindications stated in the patient information leaflet — read the leaflet that comes with your Odyral pack carefully
If you are unsure whether you have had an allergic reaction to this product or a related medicine in the past, discuss this with your doctor or pharmacist before starting treatment.
Warnings and Precautions
Before using Odyral, tell your prescribing physician if any of the following apply:
- Pre-existing eye disease: Glaucoma, ocular hypertension, severe dry eye, corneal disease, previous eye surgery (including corneal transplantation, cataract surgery, refractive laser surgery) or a current eye infection
- Allergies: Any previous allergic reaction to eye drops, cosmetics applied near the eyes, or systemic medicines
- Contact lens wear: Type of lens (soft hydrogel, silicone hydrogel, rigid gas-permeable), wearing schedule, and use of lens solutions
- Use of other eye drops: All other ophthalmic products, including over-the-counter lubricants, allergy drops, and prescription drops for glaucoma or infection
- Systemic medicines: Although topical ophthalmic absorption is limited, interactions can occur — provide a complete medication list
- Pregnancy, planned pregnancy or breastfeeding: Discuss the risks and benefits with your physician
- Driving or operating machinery: Most eye drops cause transient blurred vision immediately after instillation
- Severe or persistent eye pain, redness, or marked visual blurring
- Swelling of the eyelids, face, lips, tongue or throat (possible allergic reaction)
- New onset of floaters, flashes of light, or a curtain-like shadow in your vision
- Yellow, green or bloody discharge from the eye, which may indicate infection
- Increasing light sensitivity (photophobia) or double vision
Pregnancy and Breastfeeding
If you are pregnant, planning to become pregnant, or currently breastfeeding, inform your prescribing physician before starting Odyral. For most prescription eye drops, systemic absorption after topical ocular use is substantially lower than after oral administration because only a small fraction of the instilled drop reaches the systemic circulation, and the use of punctal occlusion (gentle pressure on the inner corner of the eye for 1–2 minutes after instillation) can reduce it further.
Nevertheless, the available safety data for many ophthalmic products in pregnancy and lactation are limited, and a personalised benefit–risk discussion with your prescribing physician is always appropriate. The official patient information leaflet for Odyral will state the manufacturer's specific advice for use during pregnancy and breastfeeding. In most cases, a decision is made case-by-case, balancing the risk of untreated eye disease against any theoretical risk to the foetus or infant.
Driving and Operating Machinery
Most eye drops cause transient blurred vision for a few minutes after instillation. You should wait until your vision returns to normal before driving, operating heavy machinery, or performing other activities that require sharp vision. If Odyral causes persistent visual disturbance beyond a few minutes, do not drive and contact your prescriber.
Use in Children
Prescription eye drops can sometimes be used in children, but the approved age ranges, doses and indications differ between products and countries. Odyral should only be given to a child if it has been specifically prescribed for that child by a paediatric ophthalmologist or another qualified prescriber. Do not use prescription eye drops that were prescribed for another family member, including siblings.
Use in Elderly Patients
Older patients often have multiple eye conditions simultaneously (for example, dry eye plus glaucoma plus age-related cataract), are more likely to be using several eye drops at the same time, and may have greater difficulty with the manual dexterity required to use single-dose containers accurately. Ask your pharmacist or nurse to demonstrate instillation technique if needed, and consider using a drop-aid device if you find single-dose containers difficult to handle.
Contact Lens Use
If you normally wear contact lenses, discuss this with your prescriber before starting Odyral. A common general recommendation for most prescription eye drops is to remove contact lenses before instilling the drop and to wait at least 15 minutes before reinserting lenses, since this allows the active substance to act on the eye surface and reduces the chance that lens materials will absorb the medicine or its excipients. Your ophthalmologist may also advise you to stop wearing lenses entirely during a course of treatment if your eye condition is made worse by lens wear.
How Does Odyral Interact with Other Drugs?
Because Odyral is applied topically to the eye, systemic drug interactions are generally limited. However, interactions can occur with other eye drops used at the same time, and tell your prescriber about every medicine and supplement you take. Always separate different eye drops by at least 5–10 minutes to avoid washout of the first medicine.
Topical ophthalmic medicines reach the systemic circulation in smaller amounts than oral drugs, but some absorption does occur — primarily through the nasal mucosa after the drop drains through the nasolacrimal duct into the nose. This is why significant interactions with systemic medicines are occasionally reported for eye drops, especially for certain classes such as topical beta-blockers. Although interactions for Odyral specifically depend on its active substance profile (see the official product information), some general principles apply to all ophthalmic medicines.
Interactions with other eye drops
The most common form of interaction for topical eye medicines is washout — when two drops are instilled too close together in time, the second drop dilutes or washes away the first before it has been absorbed. To avoid this:
| Combination | Recommended Interval | Rationale |
|---|---|---|
| Two aqueous eye drops | At least 5 minutes apart | Prevents washout of the first drop |
| Eye drop then eye ointment | Drop first, then ointment at least 5–10 minutes later | Ointments trap subsequent drops and reduce absorption |
| Eye drop then lubricant gel | Drop first, then lubricant at least 10 minutes later | Allows the active drop to bind to the eye surface |
| Suspension (shake-before-use) drops | Instill suspensions last | Suspensions have longer ocular residence and may displace others |
Interactions with systemic medicines
Systemic interactions are less common with eye drops than with oral medicines, but they can occur. Always inform your prescribing ophthalmologist and pharmacist about:
- Other prescription medicines: including blood pressure medicines, diabetes medicines, anticoagulants, and hormonal treatments
- Over-the-counter products: analgesics, antihistamines, cold remedies, and supplements
- Herbal products: St. John's wort, ginkgo biloba, and other botanicals can interact with many medicines
- Recreational substances: alcohol, tobacco, and other substances where relevant
- Topical products applied around the eye: cosmetics, creams and lotions can occasionally interact with eye drops
After instilling an eye drop, gently pressing the inner corner of the eye (just beside the nose) with a fingertip for 1–2 minutes helps block the tear duct and prevents the drop from draining into the nose, where it would be absorbed into the bloodstream. This simple technique can significantly reduce systemic side effects and is particularly helpful for patients taking drops long-term or for those on multiple medications.
What Is the Correct Dosage of Odyral?
The exact dose and frequency of Odyral are prescribed individually by your ophthalmologist. Typical prescription eye drop regimens range from once a day to several times a day, depending on the condition being treated. Always follow your prescriber's instructions and the patient information leaflet, and never increase the frequency on your own.
Because Odyral is a prescription medicine, the dose you are given will have been selected for you personally after an eye examination. Your ophthalmologist considers the specific diagnosis, severity of the condition, any previous response to treatment, concurrent medications, and individual factors such as age and pregnancy status before writing the prescription. This means the correct dose of Odyral for one patient may be quite different from that for another, even if both are using the same product.
Adults
General principle
Instill the prescribed number of drops into the affected eye(s) at the times directed by your prescriber. For most prescription eye drops, the dose is one drop per administration — more is not better, since the eye cannot hold a larger volume and additional drops simply overflow. Treatment may be short-term (a few days to a few weeks) or long-term (months to years), depending on the diagnosis.
Children
Use in children depends on the specific indication and the approved product information. Never use Odyral in a child unless it has been prescribed specifically for that child by a qualified prescriber. Paediatric patients may need a different dose frequency, and the child's comfort and cooperation must be considered. For very young or frightened children, drops can sometimes be applied while the child is lying down with eyes closed, placing the drop in the inner corner of the eye so that it rolls in when the child opens the eye.
Elderly Patients (65 years and older)
No general dose adjustment is routinely required for elderly patients using prescription eye drops, but age-related factors deserve attention: reduced manual dexterity, tremor, or visual impairment can make single-dose container handling more difficult; polypharmacy increases the chance of interactions; and the ocular surface is often drier in older adults, which can affect tolerance. Ask for a demonstration of correct technique and discuss any difficulty handling the container with your pharmacist.
Missed Dose
If you forget a dose of Odyral, instill it as soon as you remember. However, if it is almost time for the next dose, skip the missed dose and continue with your usual schedule. Do not instill a double dose to make up for a forgotten one; more drops are not better and can increase the risk of side effects.
Overdose
Using more drops than prescribed is rarely dangerous in the short term, because the eye simply cannot hold more than one drop at a time and excess fluid overflows. However, repeated excessive use can increase local irritation and, for some active substances, systemic absorption. If Odyral is accidentally swallowed — for example, by a child who opens a single-dose container — contact your doctor, hospital emergency department, or national poisons information centre immediately. Take the packaging with you so that medical staff can identify the product.
Duration of Treatment
Do not stop treatment early, even if your symptoms improve, unless advised to do so by your prescriber. Many eye conditions need to be treated for the full prescribed duration to prevent relapse. Conversely, do not extend treatment beyond the prescribed period without medical advice — long-term use of certain ophthalmic medicines can cause adverse effects such as raised intraocular pressure, cataract formation, or delayed healing, depending on the active ingredient.
How to Use Single-Dose Containers Correctly
Correct technique is essential for effective treatment. Follow these steps for each instillation:
| Step | Action | Purpose |
|---|---|---|
| 1. Prepare | Wash and dry your hands thoroughly | Prevents contamination of the container tip and the eye |
| 2. Check | Inspect the solution: should be clear and within the expiry date | Avoids using a damaged or degraded product |
| 3. Open | Twist or snap off the top of the single-dose container | Opens the sterile unit immediately before use |
| 4. Position | Tilt head back; gently pull lower eyelid down to form a pocket | Creates space to receive the drop |
| 5. Instill | Hold the container above the eye and squeeze one drop into the pocket | Delivers a single therapeutic dose |
| 6. Close | Gently close the eye for 1–2 minutes; do not rub | Allows the drop to spread across the eye surface |
| 7. Occlude | Press lightly on the inner corner of the eye for 1–2 minutes | Reduces systemic absorption via the nasolacrimal duct |
| 8. Discard | Discard the single-dose container immediately after use | Maintains sterility — do not save remaining solution |
If you find it difficult to keep your eye open during instillation, try lying down or resting a supporting finger against your cheekbone. For patients with tremor or reduced manual dexterity, drop-aid devices are available from pharmacies. If you need to instill drops into both eyes, use one single-dose container per eye (or follow the instructions in your leaflet) to maintain sterility. Never let the tip of the container touch your eye, eyelid, eyelashes, fingers or any other surface.
What Are the Side Effects of Odyral?
As with all prescription eye drops, Odyral may cause side effects. Most are local to the eye and transient — such as brief stinging, burning, blurred vision, redness or a foreign-body sensation just after instillation. Rarely, allergic reactions, persistent visual disturbance or systemic effects can occur. Seek medical advice for any persistent or severe symptoms.
Not every patient who uses Odyral will experience side effects. The frequency and nature of adverse reactions depend on the active ingredient, the individual patient, and the duration of treatment. The product-specific patient information leaflet lists all reported adverse reactions for Odyral along with their frequencies; this is the authoritative source for your specific product.
- Sudden decrease or loss of vision in one or both eyes
- Severe eye pain with nausea or vomiting (possible angle-closure glaucoma attack)
- Swelling of the lips, tongue, throat or difficulty breathing (possible anaphylaxis)
- Widespread rash, hives, or blisters on the skin
- Yellow or green discharge, severe redness, and pain (possible serious infection)
Side effects by frequency
Adverse reactions to topical ophthalmic medicines are generally classified into the following frequency categories, using the standard terminology of the Council for International Organizations of Medical Sciences (CIOMS). Your product's patient information leaflet will classify specific reactions into these categories for Odyral:
Very Common
May affect more than 1 in 10 people
- Transient stinging or burning sensation at the time of instillation
- Brief blurred vision for a few minutes after instillation
- Mild redness of the eye
- Increased tearing
Common
May affect up to 1 in 10 people
- Foreign-body sensation (feeling that something is in the eye)
- Eyelid irritation or mild itching
- Dry sensation of the eye
- Sticky sensation of the eyelid
- Mild headache or taste disturbance (from nasolacrimal drainage)
Uncommon
May affect up to 1 in 100 people
- Persistent blurred vision lasting more than a few minutes
- Allergic conjunctivitis (itching, redness, eyelid swelling)
- Superficial punctate keratitis (small spots on the corneal surface)
- Eyelid dermatitis (skin rash around the eye)
Rare or Very Rare
May affect up to 1 in 1,000 people or fewer
- Severe allergic reaction (angioedema, anaphylaxis)
- Corneal ulceration or erosion
- Raised intraocular pressure
- Secondary eye infection
- Systemic symptoms from nasolacrimal absorption (depending on active ingredient)
Reporting suspected side effects
Reporting adverse drug reactions is an important contribution to the safe use of medicines. In most countries there is a national pharmacovigilance authority that collects these reports and uses the data to detect emerging safety issues. You can report suspected side effects directly to your healthcare provider, your pharmacist, or to the pharmacovigilance authority in your country. Reports can often be made by patients themselves, not just by health professionals.
Children and adolescents
No additional side effects specific to children are usually expected, but children may be less able to describe subjective symptoms such as stinging or blurred vision. Watch for behavioural signs of ocular discomfort (rubbing, avoidance of light, closed eye). If Odyral is prescribed for a child, the prescribing physician will discuss which symptoms should prompt immediate re-evaluation.
How Should You Store Odyral?
Store Odyral single-dose containers as directed on the packaging, typically below 25 °C (77 °F) and protected from light. Keep containers in the original outer packaging until use. Once opened, a single-dose container must be used immediately and any remaining solution discarded. Keep out of the sight and reach of children.
Proper storage is essential to maintain the sterility and stability of Odyral throughout its shelf life. The exact storage conditions for your product are printed on the carton and on each blister strip of single-dose containers; follow those instructions precisely.
- Temperature: Typically store below 25 °C (77 °F). Do not freeze. Do not store near heat sources such as radiators, direct sunlight, or inside a parked car in warm weather
- Light protection: Keep single-dose containers in the original outer carton to protect them from light until just before use
- Humidity: Store in a dry place; do not store in bathrooms where humidity is often high
- Original packaging: Retain the blister strip and outer carton — these provide protection and carry the expiry date and batch number
- Single-dose rule: Each container is for one use only; discard after use even if solution remains in the container
- After opening the sachet: Some single-dose products have a limited "in-use" period once the outer foil is opened (for example, the remaining containers in a strip should be used within a specified number of days). Check your leaflet for the exact period
- Expiry: Do not use Odyral after the expiry date printed on the packaging. Expired ophthalmic solutions may lose potency or become a source of infection
- Disposal: Do not dispose of medicines via wastewater or household waste. Return unused or expired single-dose containers to your local pharmacy for safe disposal in accordance with local regulations
- Child safety: Keep all medicines, including single-dose containers, out of the sight and reach of children
When travelling with Odyral, keep the containers in their original packaging and protect them from extreme temperatures. For flights, carry your eye drops in hand luggage along with your prescription or patient information leaflet, as customs authorities may ask to see evidence that you are travelling with prescription medicines. In hot climates, a small insulated pouch can help keep the medication within the recommended temperature range.
What Does Odyral Contain?
Each Odyral single-dose container holds a sterile ophthalmic solution with an active ingredient concentration of 20 mg/ml. In addition to the active substance, the solution contains excipients selected to make the drop isotonic with tears, to maintain a suitable pH, and to preserve stability. The full qualitative composition is listed in the patient information leaflet that accompanies the product.
Understanding what is in your eye drops is particularly important if you have known allergies or sensitivities to specific excipients, or if you are cross-reacting to related compounds. Always read the full ingredient list on the package leaflet for the Odyral product you are dispensed, as formulations can differ by country and manufacturing site.
Active substance
The active ingredient is odyral. Each millilitre of solution contains 20 mg (2%) of the active substance, delivered in a sterile aqueous base. Each single-dose container is designed to provide sufficient solution for a single administration, typically to both eyes, though your prescriber will specify the exact amount.
Typical excipients in prescription eye drops
Ophthalmic solutions are carefully balanced with excipients to make them well tolerated by the eye. Common categories include:
- Tonicity agents: Sodium chloride or similar salts bring osmolarity close to that of natural tears (around 290–310 mOsm/kg) — too high or too low an osmolarity causes stinging
- Buffering agents: Citrate, phosphate or borate buffers maintain pH close to the physiological tear pH (approximately 7.0–7.4)
- Viscosity enhancers: Low-concentration polymers (such as hyaluronic acid or cellulose derivatives) can prolong ocular surface contact time and improve bioavailability
- Solubilisers: In some formulations, surfactants or co-solvents help keep the active ingredient in solution
- Water for injections: The sterile aqueous vehicle that forms the bulk of the solution
Because Odyral is supplied as a single-dose, preservative-free product, it does not contain typical preservatives such as benzalkonium chloride, polyquaternium-1, or chlorhexidine. This is one of the key advantages of the single-dose format for patients with ocular surface disease or those requiring long-term therapy.
If you have a known allergy to any excipient listed in the Odyral patient information leaflet — even one you might consider a "minor" ingredient — inform your prescriber before starting treatment. Allergic reactions to excipients are less common than to active ingredients but can still cause significant ocular discomfort or systemic reactions. If you develop worsening redness, itching or eyelid swelling after starting Odyral, stop using the drops and seek medical advice.
Appearance and identification
Odyral 20 mg/ml is supplied as a clear solution in small, individually sealed single-dose containers packaged within a foil sachet and outer carton. Always check before use that the single-dose container is intact and that the solution appears clear and free from visible particles. Do not use any container that is damaged or leaking, or if the solution looks unusual.
Frequently Asked Questions About Odyral
Medical References and Sources
This article is based on current medical research, international guidelines, and approved prescribing information. All general claims about prescription ophthalmic solutions are supported by scientific evidence from peer-reviewed sources. For product-specific information about Odyral, always refer to the approved patient information leaflet and the advice of your prescribing physician.
- European Medicines Agency (EMA). "Guideline on Quality of Ophthalmic Products." EMA Medicines Database European regulatory guidance on the quality and safety of ophthalmic preparations including single-dose formats.
- World Health Organization (WHO). "WHO Model List of Essential Medicines, 23rd List (2023) — Ophthalmological Preparations." WHO Essential Medicines Global reference list of essential ophthalmic medicines.
- British National Formulary (BNF). "Drugs Used in Eye — General Guidance." BNF Ophthalmic Section Comprehensive prescribing guidance for topical ophthalmic medicines.
- U.S. Food and Drug Administration (FDA). "Guidance for Industry: Ophthalmic Drug Products — Quality Considerations." FDA Ophthalmic Drug Products U.S. regulatory standards for ophthalmic formulations.
- Baudouin C, et al. (2010). "Preservatives in eyedrops: the good, the bad and the ugly." Progress in Retinal and Eye Research. 29(4):312-334. doi:10.1016/j.preteyeres.2010.03.001 Landmark review of the impact of preservatives on the ocular surface and the rationale for preservative-free formulations.
- Jaenen N, et al. (2007). "Ocular symptoms and signs with preserved and preservative-free glaucoma medications." European Journal of Ophthalmology. 17(3):341-349. Evidence for improved ocular surface tolerability with preservative-free single-dose ophthalmic formulations.
- American Academy of Ophthalmology (AAO). "Preferred Practice Pattern — Dry Eye Syndrome (2023)." AAO Preferred Practice Patterns Evidence-based guidance on the management of ocular surface disease and topical therapy.
- Davies I, et al. (2017). "Drug delivery to the eye: Topical ocular drug delivery." Journal of Drug Targeting. 25(9-10):784-794. Review of ocular pharmacokinetics, including the rationale for nasolacrimal occlusion and drop spacing.
Evidence grading: This article uses the GRADE framework (Grading of Recommendations Assessment, Development and Evaluation) for evidence-based medicine. Evidence level 1A represents the highest quality of evidence, based on systematic reviews of randomised controlled trials.
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