Glyceryl T Side Effects

Generic name: guaifenesin / theophylline

Medically reviewed by Drugs.com. Last updated on Jun 26, 2024.

Note: This document provides detailed information about Glyceryl T Side Effects associated with guaifenesin / theophylline. Some dosage forms listed on this page may not apply specifically to the brand name Glyceryl T.

Applies to guaifenesin / theophylline: oral capsule, oral liquid.

Important warnings This medicine can cause some serious health issues

Call your doctor right away if you experience nausea, vomiting, insomnia, restlessness, seizures, an increased heart rate, or a headache.

These symptoms could be signs of too much theophylline in your blood.

Do not start or stop smoking without first talking to your doctor.

Smoking changes the way your body uses theophylline, and you may need a dose adjustment.

Do not take more of this medicine than is prescribed without consulting your doctor.

Seek medical attention if you are having increasingly difficult breathing.

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

Call your doctor at once if you have a serious side effect such as:

• seizure (convulsions);

• fast or uneven heart rate; or

• severe nausea or vomiting.

Less serious side effects of guaifenesin / theophylline may include:

• mild skin rash;

• slight nausea, decreased appetite, or weight loss;

• restlessness, tremor, or insomnia; or

• headache, lightheadedness, or dizziness.

This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects.

Further information

Glyceryl T side effects can vary depending on the individual. Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.

Some side effects may not be reported. You may report them to the FDA.

Medical Disclaimer