Basic Information on Phenylephrine

When and How to Take It

Some general considerations include the following:
  • For oral forms of this medication, it does not matter if you take phenylephrine with food or on an empty stomach. If the medication seems to bother your stomach, try taking it with a little food.
  • Because there are several different phenylephrine products available, make sure to follow the instructions for your particular product.
  • Some people find that phenylephrine interferes with their ability to fall asleep. If you experience this problem, try taking your last dose earlier in the day.
  • For the medication to work properly, it must be taken as directed.

Dosing Information for Phenylephrine

The recommended dose of phenylephrine will vary, depending on a number of factors, including:
  • The particular product
  • The medical condition being treated
  • Your age
  • Other medications you are taking
  • Other medical conditions you may have.
As is always the case, do not adjust your dose unless your healthcare provider specifically instructs you to do so.

Drug Interactions

Phenylephrine can potentially interact with several other medicines (see Drug Interactions With Phenylephrine).

What If I Take an Overdose?

An overdose with phenylephrine can cause serious problems. If you happen to overdose on this medication, seek immediate medical attention.
(Click Phenylephrine Overdose for more information.)
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Phenylephrine Medication Information

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