* Relieves redness of the eye due to minor eye irritations
as a lubricant to prevent further irritation or to relieve dryness of the eye
======Dosing information======
*Instill 1 or 2 drops in the affected eye(s) up to four times daily
<!--Off-Label Use and Dosage (Adult)-->
<!--Guideline-Supported Use (Adult)-->
|offLabelAdultGuideSupport=
There is limited information regarding <i>Off-Label Guideline-Supported Use</i> of {{PAGENAME}} in adult patients.
<!--Non–Guideline-Supported Use (Adult)-->
|offLabelAdultNoGuideSupport=
There is limited information regarding <i>Off-Label Non–Guideline-Supported Use</i> of {{PAGENAME}} in adult patients.
<!--Pediatric Indications and Dosage-->
<!--FDA-Labeled Indications and Dosage (Pediatric)-->
|fdaLIADPed=
There is limited information regarding <i>FDA-Labeled Use</i> of {{PAGENAME}} in pediatric patients.
<!--Off-Label Use and Dosage (Pediatric)-->
<!--Guideline-Supported Use (Pediatric)-->
|offLabelPedGuideSupport=
There is limited information regarding <i>Off-Label Guideline-Supported Use</i> of {{PAGENAME}} in pediatric patients.
<!--Non–Guideline-Supported Use (Pediatric)-->
|offLabelPedNoGuideSupport=
There is limited information regarding <i>Off-Label Non–Guideline-Supported Use</i> of {{PAGENAME}} in pediatric patients.
<!--Contraindications-->
|contraindications=
<!--Warnings-->
|warnings=
*For external use only
*Ask a doctor before use if you have narrow angle glaucoma
*When using this product
:*pupils may become enlarged temporarily
:*to avoid contamination, do not touch tip of container to any surface. Replace cap after using.
:*if solution changes color or becomes cloudy, do not use
:*overuse may produce increased redness of the eye
:*remove contact lens before using
*Stop use and ask a doctor if you experience
:*eye pain
:*changes in vision
:*continued redness or irritation of the eye, or if the condition worsens or persists for more than 72 hours
<!--Adverse Reactions-->
<!--Clinical Trials Experience-->
|clinicalTrials=
There is limited information regarding <i>Clinical Trial Experience</i> of {{PAGENAME}} in the drug label.
<!--Postmarketing Experience-->
|postmarketing=
There is limited information regarding <i>Postmarketing Experience</i> of {{PAGENAME}} in the drug label.
<!--Drug Interactions-->
|drugInteractions=
<!--Use in Specific Populations-->
|useInPregnancyFDA=
* Ask a health professional before use.
|useInPregnancyAUS=
* '''Australian Drug Evaluation Committee (ADEC) Pregnancy Category'''
There is no Australian Drug Evaluation Committee (ADEC) guidance on usage of {{PAGENAME}} in women who are pregnant.
|useInLaborDelivery=
There is no FDA guidance on use of {{PAGENAME}} during labor and delivery.
|useInNursing=
*Ask a health professional before use.
|useInPed=
There is no FDA guidance on the use of {{PAGENAME}} with respect to pediatric patients.
|useInGeri=
There is no FDA guidance on the use of {{PAGENAME}} with respect to geriatric patients.
|useInGender=
There is no FDA guidance on the use of {{PAGENAME}} with respect to specific gender populations.
|useInRace=
There is no FDA guidance on the use of {{PAGENAME}} with respect to specific racial populations.
|useInRenalImpair=
There is no FDA guidance on the use of {{PAGENAME}} in patients with renal impairment.
|useInHepaticImpair=
There is no FDA guidance on the use of {{PAGENAME}} in patients with hepatic impairment.
|useInReproPotential=
There is no FDA guidance on the use of {{PAGENAME}} in women of reproductive potentials and males.
|useInImmunocomp=
There is no FDA guidance one the use of {{PAGENAME}} in patients who are immunocompromised.
<!--Administration and Monitoring-->
|administration=
*Topical
|monitoring=
There is limited information regarding <i>Monitoring</i> of {{PAGENAME}} in the drug label.
<!--IV Compatibility-->
|IVCompat=
There is limited information regarding <i>IV Compatibility</i> of {{PAGENAME}} in the drug label.
<!--Overdosage-->
|overdose=
There is limited information regarding <i>Chronic Overdose</i> of {{PAGENAME}} in the drug label.
<!--Pharmacology-->
<!--Drug box 2-->
|drugBox=
<!--Mechanism of Action-->
|mechAction=
*
<!--Structure-->
|structure=
*
: [[File:{{PAGENAME}}01.png|thumb|none|600px|This image is provided by the National Library of Medicine.]]
<!--Pharmacodynamics-->
|PD=
There is limited information regarding <i>Pharmacodynamics</i> of {{PAGENAME}} in the drug label.
<!--Pharmacokinetics-->
|PK=
There is limited information regarding <i>Pharmacokinetics</i> of {{PAGENAME}} in the drug label.
<!--Nonclinical Toxicology-->
|nonClinToxic=
There is limited information regarding <i>Nonclinical Toxicology</i> of {{PAGENAME}} in the drug label.
<!--Clinical Studies-->
|clinicalStudies=
There is limited information regarding <i>Clinical Studies</i> of {{PAGENAME}} in the drug label.
<!--How Supplied-->
|howSupplied=
*
<!--Patient Counseling Information-->
|fdaPatientInfo=
There is limited information regarding <i>Patient Counseling Information</i> of {{PAGENAME}} in the drug label.
<!--Precautions with Alcohol-->
|alcohol=
* Alcohol-{{PAGENAME}} interaction has not been established. Talk to your doctor about the effects of taking alcohol with this medication.
<!--Brand Names-->
|brandNames=
* ®<ref>{{Cite web | title = | url = }}</ref>
{{SI}}
<!--Look-Alike Drug Names-->
{{CMG}}
|lookAlike=
<!--Drug Shortage Status-->
==Overview==
|drugShortage=
'''Tetrahydrozoline''' is a derivative of [[imidazoline]], which is found in over-the-counter [[eye drop]]s and [[nasal spray]]s. Other derivatives include [[naphazoline]], [[oxymetazoline]], and [[xylometazoline]]. [[Poison]]ing can result from an [[overdose]].
}}
Tetrahydrozoline is widely believed to cause violent diarrhea if administered orally, as in a few drops of [[Visine]] in an unsuspecting person's beverage. However, this is an urban legend, and the actual results may vary from severe nausea and vomiting to seizures or a coma.<ref>http://www.snopes.com/medical/myths/visine.asp</ref> Diarrhea is ''not'' a side effect.
==See also==
<!--Label Display Image-->
*[[Visine]]
==References==
{{LabelImage
<references/>
|fileName={{PAGENAME}}11.png|This image is provided by the National Library of Medicine.
}}
{{Nasal preparations}}
{{LabelImage
[[Category:Sympathomimetics]]
|fileName={{PAGENAME}}11.png|This image is provided by the National Library of Medicine.
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Overview
Tetrahydrozoline is a that is FDA approved for the {{{indicationType}}} of . Common adverse reactions include .
Adult Indications and Dosage
FDA-Labeled Indications and Dosage (Adult)
Dryness of the eye
Relieves redness of the eye due to minor eye irritations
as a lubricant to prevent further irritation or to relieve dryness of the eye
Dosing information
Instill 1 or 2 drops in the affected eye(s) up to four times daily
Off-Label Use and Dosage (Adult)
Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Tetrahydrozoline in adult patients.
Non–Guideline-Supported Use
There is limited information regarding Off-Label Non–Guideline-Supported Use of Tetrahydrozoline in adult patients.
Pediatric Indications and Dosage
FDA-Labeled Indications and Dosage (Pediatric)
There is limited information regarding FDA-Labeled Use of Tetrahydrozoline in pediatric patients.
Off-Label Use and Dosage (Pediatric)
Guideline-Supported Use
There is limited information regarding Off-Label Guideline-Supported Use of Tetrahydrozoline in pediatric patients.
Non–Guideline-Supported Use
There is limited information regarding Off-Label Non–Guideline-Supported Use of Tetrahydrozoline in pediatric patients.
Contraindications
There is limited information regarding Tetrahydrozoline Contraindications in the drug label.
Warnings
For external use only
Ask a doctor before use if you have narrow angle glaucoma
When using this product
pupils may become enlarged temporarily
to avoid contamination, do not touch tip of container to any surface. Replace cap after using.
if solution changes color or becomes cloudy, do not use
overuse may produce increased redness of the eye
remove contact lens before using
Stop use and ask a doctor if you experience
eye pain
changes in vision
continued redness or irritation of the eye, or if the condition worsens or persists for more than 72 hours
Adverse Reactions
Clinical Trials Experience
There is limited information regarding Clinical Trial Experience of Tetrahydrozoline in the drug label.
Postmarketing Experience
There is limited information regarding Postmarketing Experience of Tetrahydrozoline in the drug label.
Drug Interactions
There is limited information regarding Tetrahydrozoline Drug Interactions in the drug label.