1 What is Jay-Phyl?

Brand: Jay-Phyl

Generic: Dyphylline and Guaifenesin

Jay-Phyl is a drug which is used to treat the symptoms of asthma, chronic bronchitis and emphysema. This drug is available as a 100mg-50mg/5ml syrup.


You should read the product information leaflet before using this medication. If you have any questions, ask your doctor or pharmacist.

This medication should be taken by mouth as instructed by your doctor. Use a measuring spoon. Your dosage is based on your medical condition and the way you will respond to treatment. Take this drug regularly to experience the most benefits. You should also take this drug at the same time each day.

If you miss a dose, use it as soon as you remember. Continue to use it as prescribed by your doctor or as stated on the package label.


Jay-Phyl may interact with medications such as:

  • Lithium
  • Bupropion
  • Isoniazid (INH)
  • Phenothiazines such as thioridazine
  • Tramadol
  • Tricyclic antidepressants such as amitriptyline

Side Effects:

There are no side effects known aside from a possible allergic reaction in people who have previous or unknown hypersensitivity to the drug.

Watch out for signs of allergic reactions such as:

  • Rash
  • Itching
  • Swelling


Before taking this medication, tell your doctor or pharmacist if you have the following:

  • Allergy to Dyphylline or Guaifenesin
  • Allergy to similar drugs such as theophylline
  • Heart problems
  • High blood pressure
  • Kidney disease
  • Seizures
  • Peptic ulcer
  • Hyperthyroidism
  • Pregnancy or lactation

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