Generic name: hypromellose [ hye-PROE-me-lose ]
Brand names: Genteal, Genteal Mild, Gonak, Goniosoft, Goniovisc, ... show all 9 brands
Uses for Gonak
Hydroxypropyl methylcellulose belongs to the group of medicines known as artificial tears. It is used to relieve dryness and irritation caused by reduced tear flow. It helps prevent damage to the eye in certain eye diseases. Hydroxypropyl methylcellulose may also be used to moisten hard contact lenses and artificial eyes. In addition, it may be used in certain eye examinations.
Some of these preparations are available only with your doctor's prescription.
Before using Gonak
In deciding to use a medicine, the risks of taking the medicine must be weighed against the good it will do. This is a decision you and your doctor will make. For this medicine, the following should be considered:
Tell your doctor if you have ever had any unusual or allergic reaction to this medicine or any other medicines. Also tell your health care professional if you have any other types of allergies, such as to foods, dyes, preservatives, or animals. For non-prescription products, read the label or package ingredients carefully.
Although there is no specific information comparing use of hydroxypropyl methylcellulose in children with use in other age groups, this medicine is not expected to cause different side effects or problems in children than it does in adults.
Many medicine have not been studied specifically in older people. Therefore, it may not be known whether they work exactly the same way they do in younger adults. Although there is no specific information comparing use of hydroxypropyl methylcellulose in the elderly with use in other age groups, this medicine is not expected to cause different side effects or problems in older people than it does in younger adults.
There are no adequate studies in women for determining infant risk when using this medication during breastfeeding. Weigh the potential benefits against the potential risks before taking this medication while breastfeeding.
Interactions with Medicines
Although certain medicines should not be used together at all, in other cases two different medicines may be used together even if an interaction might occur. In these cases, your doctor may want to change the dose, or other precautions may be necessary. Tell your healthcare professional if you are taking any other prescription or nonprescription (over-the-counter [OTC]) medicine.
Interactions with Food/Tobacco/Alcohol
Certain medicines should not be used at or around the time of eating food or eating certain types of food since interactions may occur. Using alcohol or tobacco with certain medicines may also cause interactions to occur. Discuss with your healthcare professional the use of your medicine with food, alcohol, or tobacco.
Proper use of Gonak
- First, wash your hands. Then tilt the head back and pull the lower eyelid away from the eye to form a pouch. Drop the medicine into the pouch and gently close the eyes. Do not blink. Keep the eyes closed for 1 or 2 minutes to allow the medicine to be absorbed.
- To keep the medicine as germ-free as possible, do not touch the applicator tip to any surface (including the eye). Also, keep the container tightly closed.
For patients wearing hard contact lenses:
- Take care not to float the lens from your eye when applying this medicine. If you have any questions about this, check with your health care professional.
The dose of this medicine will be different for different patients. Follow your doctor's orders or the directions on the label. The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.
The amount of medicine that you take depends on the strength of the medicine. Also, the number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.
- For dry eyes:
- For ophthalmic solution (eye drops) dosage form:
- Adults and children—Use 1 drop three or four times a day.
- For ophthalmic solution (eye drops) dosage form:
Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep from freezing.
Keep out of the reach of children.
Do not keep outdated medicine or medicine no longer needed.
Precautions while using Gonak
If you experience eye pain, changes in vision, continued redness or irritation of the eye, or if your symptoms continue for more than 3 days or become worse, check with your doctor.
Side Effects of Gonak
Along with its needed effects, a medicine may cause some unwanted effects. Although not all of these side effects may occur, if they do occur they may need medical attention.
Check with your doctor as soon as possible if any of the following side effects occur:
- Eye irritation not present before use of this medicine
Some side effects may occur that usually do not need medical attention. These side effects may go away during treatment as your body adjusts to the medicine. Also, your health care professional may be able to tell you about ways to prevent or reduce some of these side effects. Check with your health care professional if any of the following side effects continue or are bothersome or if you have any questions about them:
Less common- more common with 1% solution
- Blurred vision
- matting or stickiness of eyelashes
Other side effects not listed may also occur in some patients. If you notice any other effects, check with your healthcare professional.
Call your doctor for medical advice about side effects. You may report side effects to the FDA at 1-800-FDA-1088.
Commonly used brand name(s)
In the U.S.
- Genteal Mild
- Isopto Tears
- Nature's Tears
- Tears Again Mc
Available Dosage Forms:
Therapeutic Class: Surgical Aid, Ocular
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.