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Guaifenesin/Phenylephrine

Guaifenesin/Phenylephrine Dosage

Robert Chad Hakim, PharmD, BCCCPKristianne Hannemann, PharmD
Reviewed by Robert Chad Hakim, PharmD, BCCCP, Kristianne Hannemann, PharmD
Last reviewed on November 13, 2024

The average cost for 30 tablets of 400mg/10mg of Guaifenesin/Phenylephrine is $10.98 with a free GoodRx coupon.

tabletTablet

Dosage

Quantity

Price as low as

Price per unit

400mg/10mg

30 tablets

$10.98

$0.37

Typical dosage for Guaifenesin/Phenylephrine

There are several manufacturers that make guaifenesin/phenylephrine combination medications. Different products might have different strengths and concentrations of medication. Check the medication box for directions specific to your product.

Examples include:

Gilphex (guaifenesin / phenylephrine):

Each tablet contains 390 mg of guaifenesin and 10 mg of phenylephrine.

  • Adults and children 12 years of age or older: The typical dose is to take 1 tablet by mouth every 4 hours. Don't take more than 6 tablets within a 24-hour period.
  • Children 6 to under 12 years of age: The typical dose is to take a half tablet by mouth every 4 hours as needed. Don't take more than 3 tablets within a 24-hour period.
  • Children under 6 years of age: Ask your child's pediatrician.

ED Bron GP Liquid (guaifenesin / phenylephrine): Each 5 mL of solution contains 100 mg of guaifenesin and 5 mg of phenylephrine.

  • Adults and children 12 years of age or older: The typical dose is 2 teaspoonfuls (10 mL) by mouth every 4 hours. Don't take more than 12 teaspoonfuls (60 mL) in a 24-hour period.
  • Children 6 to under 12 years of age: The typical dose is 1 teaspoonful (5 mL) by mouth every 4 hours. Don't take more than 6 teaspoonfuls (30 mL) in a 24-hour period.
  • Children under 6 years of age: Ask your child's pediatrician.
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