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The concern goes beyond ineffectiveness; phenylephrine can come with side effects such as headaches, insomnia and nervousness. At higher doses, it can increase blood pressure.
Phenylephrine, sold under the brand names Neosynephrine and Sudafed PE among others, is a medication used as a decongestant for uncomplicated nasal congestion in the form of a nasal spray or oral tablet, [5] to dilate the pupil, to increase blood pressure given intravenously in cases of low blood pressure, and to relieve hemorrhoids as a suppository.
Due to its sympathomimetic effects, pseudoephedrine is a vasoconstrictor and pressor agent (increases blood pressure), a positive chronotrope (increases heart rate), and a positive inotrope (increases force of heart contractions). [18] [1] [22] [19] [20] The influence of pseudoephedrine on blood pressure at clinical doses is controversial.
Pseudoephedrine acts indirectly on the adrenergic receptor system, whereas phenylephrine and oxymetazoline are direct agonists. The effects are not limited to the nose, and these medicines may cause hypertension (high blood pressure) through vasoconstriction; it is for this reason that people with hypertension are advised to avoid them. Most ...
Phenylephrine is the main ingredient used in many common over-the-counter congestion products. It is safe to use, but an independent advisory committee to the FDA agreed Tuesday that it is ...
I'm assuming that since phenylephrine has a side effect of hypertension, you wouldn't want a normally hypertensive person with slight congestion taking something that would raise their blood pressure even more. It's like the side-effect being worse than the actual treatment130.49.150.51 18:18, 7 October 2008 (UTC).
The narrowing of blood vessels leads to an increase in peripheral resistance, thereby elevating blood pressure. While vasoconstriction is a normal and essential regulatory mechanism for maintaining blood pressure and redistributing blood flow during various physiological processes, its dysregulation can contribute to pathological conditions.
This is a phenomenon in which patients with hypertension take an alpha blocker for the first time, and suddenly experience an intense decrease in blood pressure. Ultimately, this gives rise to orthostatic hypotension , dizziness , and a sudden loss of consciousness due to the drastic drop in blood pressure.