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Tetryzoline

AEMPS

Topical ophthalmic sympathomimetic, decongestant

ATC code: S01GA02

Brand names: Visine, Murine

Updated · Methodology

Indications

C

Cosmetic eye redness

Adjunct

Tetryzoline removes eye redness within minutes, and that is the whole point of Vispring and Optispring. The AEMPS ficha técnica frames the indication with restraint: temporary relief of mild eye irritation in adults and children over 6 years, 1 to 2 drops 2 to 3 times a day, at most 4 times. The word «temporary» is the key one. The drug narrows vessels but does not treat whatever reddened the eye, and with regular use it adds a problem of its own: after stopping, vessels dilate more, the redness returns and the drops start being needed permanently. The ficha warns about something else too: sometimes redness is caused by infection, a foreign body or a corneal chemical burn, and then a doctor is needed rather than drops. The product is contraindicated under 2 years.

Sources

  1. AEMPS: Ficha técnica de tetrizolina (2023)

Marketing claims without evidence base

The drug is promoted for these uses outside international guidelines. Each entry below is analyzed against AEMPS, FDA, EMA, Cochrane and major RCTs.

D

Dry eye syndrome

Not recommended

For dry eyes vasoconstrictor drops look logical: the eye is red, the drops remove redness. In practice they work against the goal. Tetryzoline narrows conjunctival vessels and does not restore the tear film, while with prolonged use it produces rebound redness and irritation. The 2017 TFOS DEWS II report builds dry eye management differently: tear substitutes, lid hygiene, work on the meibomian glands, and anti-inflammatory drops where needed. The 2016 Cochrane review of over-the-counter artificial tears confirms that this is the group that relieves symptoms. The tetryzoline ficha técnica does not name dry eye as an indication at all – only temporary mild irritation. If vasoconstrictor drops were recommended for dry eyes, consider seeking a second opinion from an ophthalmologist.

Sources

  1. TFOS: TFOS DEWS II Management and Therapy Report (2017)
  2. Cochrane: Over the counter (OTC) artificial tear drops for dry eye syndrome (2016)
  3. AEMPS: Ficha técnica de tetrizolina (2023)

ICD-10: H04.1

F

Infectious conjunctivitis

Not recommended

A red eye with discharge gets «whitening» drops so that a person looks normal and goes to work. That is a dangerous move. Tetryzoline has no action on the pathogen and merely masks the sign by which the disease is noticed: the redness leaves, the infection stays. The AEMPS ficha técnica warns directly that redness is sometimes caused by serious eye disease, infection, a foreign body or a corneal chemical burn, and those need a doctor's attention. There is a separate danger for people with a narrow anterior chamber angle: vasoconstrictor drops dilate the pupil and can trigger an attack of angle-closure glaucoma – in which the eye is also red and painful. Eye pain, light sensitivity, reduced vision, purulent discharge and halos around lights call for examination the same day. If «whitening» drops were offered for a red eye with discharge, consider seeking a second opinion from an ophthalmologist.

Sources

  1. AEMPS: Ficha técnica de tetrizolina (2023)

ICD-10: H10.0 · ICD-11: 9A60.3

How to read tiers A–F
  • AStrong evidence – first or second line in international guidelines
  • BRecommended in selected cases
  • CStudy data contradict each other
  • DBenefit not proven, no documented harm
  • FDocumented harm, or risk without benefit

Mechanism of action

Tetryzoline directly stimulates alpha-adrenergic receptors of the conjunctiva and barely touches beta receptors. Vessels narrow, redness leaves within minutes and mucosal swelling subsides. The action is superficial and short, 4 to 8 hours, and it does nothing about the cause of redness – dryness, allergy, infection, a foreign body. The whole group of ocular decongestants shares one quirk: with regular use the vessels answer withdrawal with dilation, and the eye reddens more than before treatment. Systemic absorption from the eye surface does occur, so the ficha técnica lists contraindications one does not expect from drops: narrow-angle glaucoma, severe cardiovascular disease, pheochromocytoma, hyperthyroidism, diabetes, and monoamine oxidase inhibitors.

Safety

Contraindications

  • Hypersensitivity to tetryzoline
  • Angle-closure glaucoma
  • Severe cardiovascular disease, including coronary disease and arterial hypertension
  • Pheochromocytoma
  • Hyperthyroidism and diabetes mellitus
  • Monoamine oxidase inhibitors and other drugs that raise blood pressure
  • Children under 2 years

Serious adverse effects

  • Angle-closure glaucoma attack
  • Systemic sympathomimetic reactions: tachycardia, rise in blood pressure, headache
  • Drowsiness and central nervous system depression in children who swallow the drops

Common adverse effects

  • Burning and stinging after instillation
  • Pupil dilation
  • Blurred vision
  • Rebound eye redness after stopping

Pregnancy: can you take Tetryzoline?

No adequate controlled studies have been done in pregnant women and the effect of tetryzoline on the fetus is unknown. The decision rests with a doctor weighing benefit and risk.

Breastfeeding: can you take Tetryzoline?

Whether tetryzoline and its metabolites pass into breast milk is unknown. The decision to use it rests with a doctor.

Calculate RID

Reference information, not a clinical decision. Discuss feeding pauses or changes with your physician or an IBCLC.

Label mentions1 mention

Verbatim lines from the interaction sections, in the language of the label

From this drug’s label

  • antidepresivos tricíclicosclass named in the label
    «La coadministración de tetrizolina con inhibidores de la MAO y antidepresivos tricíclicos pueden potenciar la acción vasoconstrictora y aumentar la presión sanguínea.»

    AEMPS, section 4.5 · Open on CIMA

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Frequently asked

What is Tetryzoline used for?

Tetryzoline is evaluated for the following indications with varying evidence strength: Cosmetic eye redness (evidence tier C), Dry eye syndrome (evidence tier D), Infectious conjunctivitis (evidence tier F). See the full indication matrix with dosing and citations above on this page.

What are the side effects of Tetryzoline?

Common side effects of Tetryzoline (≥ 1 in 100): Burning and stinging after instillation, Pupil dilation, Blurred vision, Rebound eye redness after stopping. See the Safety section for uncommon and serious reactions.

Is Tetryzoline safe during pregnancy?

No adequate controlled studies have been done in pregnant women and the effect of tetryzoline on the fetus is unknown. The decision rests with a doctor weighing benefit and risk.

Is Tetryzoline compatible with breastfeeding?

Whether tetryzoline and its metabolites pass into breast milk is unknown. The decision to use it rests with a doctor.

Who should not take Tetryzoline?

Tetryzoline is contraindicated in: Hypersensitivity to tetryzoline; Angle-closure glaucoma; Severe cardiovascular disease, including coronary disease and arterial hypertension; Pheochromocytoma; Hyperthyroidism and diabetes mellitus. Full list in the Safety section.

Official sources

Direct links to regulator labels. Open in a new tab.

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