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Constant-T Oral

Generic Name: THEOPHYLLINE SUSTAINED-RELEASE - ORAL
Pronounced: (thee-OFF-ih-lin)

Constant-T Oral Side Effects

Stomach pain/cramping, nausea, vomiting, diarrhea, loss of appetite, headache, trouble sleeping, irritability, restlessness, nervousness, shaking, flushing, and increased urination may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.

Remember that your doctor has prescribed this medication because he or she has judged that the benefit to you is greater than the risk of side effects. Many people using this medication do not have serious side effects.

Tell your doctor immediately if any of these unlikely but serious side effects occur:

  • confusion
  • dizziness
  • mental/mood changes
  • muscle twitching/pain/tenderness
  • weakness
  • rapid breathing


Tell your doctor immediately if any of these rare but very serious side effects occur:

  • fainting
  • fast/slow/irregular heartbeat
  • vomit that looks like coffee grounds
  • dark/tarry stools
  • seizures


A very serious allergic reaction to this drug is rare. However, seek immediate medical attention if you notice any symptoms of a serious allergic reaction, including:

  • rash
  • red/scaly skin
  • itching
  • swelling
  • severe dizziness
  • trouble breathing


This is not a complete list of possible side effects. If you notice other effects not listed above, contact your doctor or pharmacist.

Constant-T Oral Medical Alert

Your condition can cause complications in a medical emergency. For information about enrolling in MedicAlert, call 1-800-854-1166 (USA) or 1-800-668-1507 (Canada).

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