Phenylephrine tablets are an oral decongestant used to relieve nasal congestion from colds, allergies, or sinus issues. They’re usually sold OTC as phenylephrine hydrochloride tablets.
Key points:
- Typical adult dose: 10 mg by mouth every 4 hours as needed, not to exceed 60 mg in 24 hours. Always follow the product’s label.
- Children: Many products are not suitable for children under 12; dosing (if any) varies by product. Check the label or ask a clinician/pharmacist.
- Efficacy: Oral phenylephrine has relatively limited evidence of benefit for some people due to absorption once taken by mouth; pseudoephedrine is often more effective but is more restricted in many places.
- Caution / who should avoid or use with care:
- High blood pressure, heart disease, heart rhythm problems, or other cardiovascular conditions
- Severe kidney or liver disease
- Diabetes, thyroid disorders, glaucoma
- Prostate enlargement causing urination problems
- Pregnancy or breastfeeding (consult a clinician)
- Taking MAO inhibitors or certain antidepressants, or other decongestants/stimulants
- Possible side effects: increased blood pressure or heart rate, nervousness, restlessness, dizziness, trouble sleeping, headache. Seek urgent care if you have chest pain, severe headache, fainting, or severe allergic reaction.
- Interactions: May interact with MAO inhibitors, certain antidepressants, blood pressure medications, and other decongestants or stimulants.
- Alternatives: Saline nasal spray, nasal steroid sprays (e.g., fluticasone, mometasone), or, if appropriate, pseudoephedrine-containing products (often behind the counter). For persistent congestion or if you have conditions listed above, consult a clinician.
If you’d like, tell me:
- Are you dosing for an adult or a child?
- Do you have any medical conditions or other medicines you’re taking?
- Are you comparing phenylephrine to pseudoephedrine, or checking efficacy?
I can tailor dosing and safety info to your situation. This is general information and not a substitute for medical advice.