May 24, 2017
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Entex La

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Entex La

Entex La Patient Information Including Side Effects

Brand Names: Aldex G, Aquatab D, Crantex, Deconex, Deconsal II, Deconsal Pediatric, Despec, Donatussin Drops, D-Phen 1000, D-Tab, Duomax, Duraphen 1000, Duraphen II, Duratuss, Dynex LA, ExeTuss, Extendryl G, Fenesin PE IR, Genexa LA, Gentex LA, Gilphex TR, Guaiphen-D 1200, Guaiphen-D 600, Guaiphen-PD, Guiadex PD, Guiatex PE, J-Max, Liquibid D-R, Liquibid-D, Liquibid-PD, Lusonex, Maxiphen, Medent-PE, MontePhen, Mucinex Children's Cold, Mucus Relief Sinus, Mydex, Nariz, Nasex, Nescon-PD, Nexphen PD, Norel EX, PE-Guai, Pendex, Prolex D, Refenesen PE, Reluri, Rescon-GG, Respa-PE, Robitussin Head & Chest Congestion, Simuc, Simuc-GP, Sina-12X, Sinupan, SINUvent PE, Sitrex PD, Sudafed PE Non-Drying Sinus, Sudex, Triaminic Chest & Nasal Congestion, Visonex, Wellbid-D, Xedec, Xedec II, Xpect-PE, Zotex GPX

Generic Name: guaifenesin and phenylephrine (Pronunciation: gwye FEN e sin and FEN il EFF rin)

What is guaifenesin and phenylephrine (Entex La)?

There are many brands and forms of guaifenesin and phenylephrine available and not all brands are listed on this leaflet.

Guaifenesin is an expectorant. It helps loosen congestion in your chest and throat, making it easier to cough out through your mouth.

Phenylephrine is a decongestant that shrinks blood vessels in the nasal passages. Dilated blood vessels can cause nasal congestion (stuffy nose).

The combination of guaifenesin and phenylephrine is used to treat stuffy nose and sinus congestion, and to reduce chest congestion caused by the common cold or flu.

Guaifenesin and phenylephrine may also be used for purposes not listed in this medication guide.

Duratuss 900 mg-25 mg

oblong, white, imprinted with 900 25

Duratuss GP 1200 mg-25 mg

oblong, white, imprinted with 1200 25


elliptical, white, imprinted with LIQUIBID-D


oblong, purple, imprinted with SINA 6301

What are the possible side effects of guaifenesin and phenylephrine?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using this medication and call your doctor at once if you have any of these serious side effects:

  • fast, pounding, or uneven heartbeat;
  • severe dizziness, anxiety, restless feeling, or nervousness;
  • easy bruising or bleeding, unusual weakness, fever, chills, body aches, flu symptoms;
  • dangerously high blood pressure (severe headache, blurred vision, buzzing in your ears, anxiety, confusion, chest pain, shortness of breath, uneven heartbeats, seizure); or
  • nausea, stomach pain, low fever, loss of appetite, dark urine, clay-colored stools, jaundice (yellowing of the skin or eyes).

Less serious side effects may include:

  • vomiting, upset stomach;
  • warmth, tingling, or redness under your skin;
  • feeling excited or restless (especially in children);
  • sleep problems (insomnia);
  • skin rash or itching;
  • headache; or
  • dizziness.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.

Read the Entex La (guaifenesin and phenylephrine) Side Effects Center for a complete guide to possible side effects

What is the most important information I should know about guaifenesin and phenylephrine?

There are many brands and forms of guaifenesin and phenylephrine available and not all brands are listed on this leaflet.

Do not give this medication to a child younger than 4 years old. Always ask a doctor before giving a cough or cold medicine to a child. Death can occur from the misuse of cough and cold medicines in very young children.

Ask a doctor or pharmacist before using any other cough, cold, or allergy medicine. Guaifenesin and phenylephrine are contained in many combination medicines. Taking certain products together can cause you to get too much of a certain drug. Check the label to see if a medicine contains guaifenesin or phenylephrine.

Side Effects Centers

Report Problems to the Food and Drug Administration


You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.

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