Phenylephrine dosage for adults?

Dosing of phenylephrine depends on the route (oral, nasal, eye drops, IV) and the indication. Here are typical adult doses, but always follow the product labeling and your clinician’s instructions.

- Oral (systemic decongestant)
- Dose: 10 mg every 4 hours as needed
- Maximum: 60 mg per day
- Notes: Systemic absorption is variable and efficacy is debated; use with caution in hypertension, heart disease, or with MAO inhibitors.

- Nasal decongestant spray (topical)
- Dose: 0.25%–0.5% solution; 1–2 sprays in each nostril as needed
- Frequency: every 4–6 hours
- Maximum use: generally not more than 3 days (to reduce rebound congestion)

- Ophthalmic drops (dilate pupil for exams)
- Concentrations: 2.5% or 10%
- Dose: 1 drop in the affected eye (may repeat after 5–10 minutes if needed)
- Notes: Use caution in people with cardiovascular disease or narrow-angle glaucoma; follow eye care professional’s instructions

- IV (in-hospital vasopressor for hypotension)
- Bolus: typically 50–100 mcg IV as needed for a hypotensive episode (may repeat)
- Infusion: start about 0.5–2 mcg/kg/min and titrate to achieve target blood pressure
- Notes: Requires continuous monitoring in a clinical setting; doses vary by patient and situation

Important safety notes
- Avoid in severe hypertension, tachyarrhythmias, or significant cardiovascular disease unless supervised.
- Interactions: monoamine oxidase inhibitors (MAOIs) and some antidepressants can raise blood pressure with phenylephrine.
- If you’re taking any prescription medications, or if you have heart disease, high blood pressure, glaucoma, or pregnancy, consult a clinician before use.
- If you’re asking for a specific product or a particular situation (e.g., nasal spray for congestion vs. IV for surgery), tell me and I’ll tailor the dosing to that scenario.

If you can share the route and indication you’re considering, I can give a more precise dosing.