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Phenylephrine is an alpha one adrenergic receptor agonist. The radial muscles of the iris are innervated by neurons with alpha one receptors thus it causes dilation when stimulated. However the ciliary body of the eye (which controls accommodation) is controlled by muscarinic 3 cholinergic receptors. That pathway for accommodation remains unaffected while the iris is dilated so you will not get cycloplegia.
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∙ 13y ago
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What drugs cause mydriasis?
for the illegal drugs: the withdrawal of opioids such as morphine is known to cause mydriasis.
What muscle is responsible for mydriasis?
a group of smooth muscles called sphincter pupillae cause the pupil constriction which is known as mydriasis.
Can chlorpheniramine maleate and phenylephrine cause seizures?
I believe phenylephrine can cause seizures in people with seizure disorders.
Does cannabis cause miosis?
No, in animals even casuse mydriasis
Does mydriasis go away on its own?
depend on the cause of the mydriasis. if it is a dysfunction of the cranial nerve number three it won't go unless treated. another cause is withdrawal from opioids and it is go on it's own.
What is paralysis of the ciliary muscles of the eye called?
cycloplegia
Do Acetaminophen and phenylephrine hci and dextromethorphan hbr react with escitalopram?
The Acetaminophen is fine with Escitalopram (Lexapro) Phenylephrine is safe to take with Lexapro, however it can cause anxiety. If you have anxiety along with your depression, Phenylephrine will exacerbate this. Dextromethorphan with Lexapro can, rarely, cause hallucinations. Take Dextromethorphan with caution and in the least effective dose.
Can phenylephrine HCL cause a false positive in any drug test?
YES! Search "phenylephrine and false positives"....you will get many websites listing many over the counter medications that can cause a positive drug screen. Phenylephrine, Dextromethorphan, & Guaifenesin...active ingredients in many cold remedies...will show positive for amphetamines
The muscles that cause mydriasis and miosi?
The dilator muscle which makes the pupil larger and the constrictor muscle which makes the pupil smaller.
Can phenylephrine in liquid Tylenol cause a dirty drug screen?
It should not cause a false positive on a drug test.
What is mydriasis?
dilation of the pupil.
Is phenylephrine an antihistamine?
No, Pseudoephedrine is a decongestant, not an antihistamine. While antihistamines reduce the bodies ability to release histamines, decongestants cause the narrowing of the blood vessels in the nasal passages.
