Insto is useful for relieving mild eye irritation symptoms, such as red, itchy, or dry eyes. This drug is available in the form of eye drops with two variants, namely Insto Regular and Insto Dry Eyes. 

Insto Regular contains the active ingredient tetrahydrozoline HCl. This material works by shrinking the blood vessels in the eyes which widen when  red  and irritated eyes occur.

Meanwhile, Insto Dry Eyes contains the active ingredient hydroxypropyl methylcellulose which provides a lubricating effect like tears, so it can treat dry eye symptoms .

Insta Products

There are two Insto products available in Indonesia, namely:

  1. Insto Regular

Insto Regular is packaged in a green bottle containing 0.05% tetrahydrozoline HCl and 0.1% benzalkonium chloride. This product is useful for treating red eyes and sore eyes caused by mild eye irritation due to dust, smoke, wind or swimming pool water.

  1. Insto Dry Eyes

Insto Dry Eyes is packaged in a blue bottle containing 3.0 mg of hydroxypropyl methylcellulose and 0.1 mg of benzalkonium chloride. This product is useful for relieving discomfort due to lack of tears, such as when in a cold place or when staring at a screen for too long.

What is Into

Active ingredients

Tetrahydrozoline HCl, hydroxypropyl methylcellulose (hypromellose)


Free medicine


Eye drops


Relieve symptoms of minor eye irritation, such as red, itchy, or dry eyes

Used by


Insto for pregnant and lactating women

Category N: Not yet categorized. 

It is not yet known whether the ingredients in Insto can be absorbed into breast milk or not.

If you are pregnant or breastfeeding, do not use this medication without consulting your doctor.

Drug form

Eye drops

Warning Before Using Insto

There are several things that you should pay attention to before using Insto, namely:

  • Do not use Insto if you are allergic to the ingredients in this medicine.
  • Consult your doctor if you plan to use Insto with other drugs, supplements, or herbal products.
  • Consult your doctor about using Insto if you are pregnant, nursing or planning a pregnancy.
  • Consult your doctor about using Insto if you have or currently have  glaucoma , heart disease, chest pain, hypertension , diabetes, eye infection or injury, or hyperthyroidism .
  • Do not immediately drive a vehicle or operate equipment that requires alertness after using Insto, because this drug can cause temporary blurred vision.
  • Do not use Insto for a long time. If your complaints have not improved or even worsened after 7 days of using Insto, consult your doctor for your condition .
  • Immediately see a doctor if an allergic drug reaction occurs after using Insto.

Dosage and Rules for Use Insto

Insto dosage varies, depending on the type of product and the patient's condition. In general, here are the Insto dosages:

  • Insto Regular
    2–3 drops in each eye, 3–4 times a day,
  • Instor Dry Eyes
    1–2 drops per eye, 3 times a day.

How to Use Insto Properly

Make sure you follow the usage instructions listed on the packaging before using Insto. Use Insto according to the recommended dosage.

Don't forget to wash your hands before and after using insto. Make sure that the tip of the bottle does not touch or come into contact with any surface to avoid contamination.

Tilt your head back and pull the lower eyelid down to form a pocket, then drop the medicine into it. After dropping the medicine, close your eyes and press the corner of the eye that is close to the nose for 2-3 minutes, then lower your head down.

Avoid pressing and rubbing your eyes, or blinking so that the medicine can work properly. If you need to put more than 1 type of drops in the same eye, wait 5 minutes before dripping it again.

If you wear contact lenses, remove them before using Insto. Wait at least 10 minutes after using Insto before putting contact lenses back in.

Store Insto in a closed container. Avoid storing the medicine in hot, humid places or exposed to direct sunlight. Keep medicine out of reach of children.

Insto Interactions with Other Drugs

Interaction effects that may occur when using instro together with certain drugs are:

  • Increased risk of developing hypertension and complications when used with the drugs dihydroergotamine, ergotamine , ergonovine, duloxetine , and albuterol
  • Decreased effectiveness of the cancer drug iobenguane I-131

Insto Side Effects and Dangers

In general, Insto is a safe eye drop if used according to the directions for use. However, the content of tetrahydrozoline and hypromellose in it can cause side effects, such as:

  • Eyes feel sore and red
  • Sensitive to light
  • Blurred vision
  • Mild irritation to eyes

Check with your doctor if these side effects don't improve or get worse. Immediately consult a doctor if you have an allergic drug reaction or more serious side effects after using Insto, such as:

  • Tremors
  • Heartbeat that feels fast and irregular ( arrhythmia )
  • Headache
  • Sweating
  • Weak
  • Flustered
  • Severe eye pain


Back to blog