Generic name: Carbinoxamine maleate with pseudoephedrine hydrochloride.

Other brand names: Carbiset Tablets, Carbodec Syrup, Carbodec Tablets.

Rondec is an antihistamine and decongestant combination. It works by blocking the effects of histamine, a body chemical that narrows air passages, reducing swelling and itching, and drying secretions.

Quick Facts About Rondeccarb612b


Used to treat nasal inflammation and runny nose, hay fever, and other allergies.

Rondec Dosage

Take exactly as prescribed.

  • Usual adult dose:  tablet or syrup form — 1 tablet or 1 teaspoonful (5 milliliters) taken 4 times per day. Rondec-TR tablet — 1 tablet taken 2 times per day. For mild cases or sensitivity — may be prescribed lower doses.
  • Usual child dose: tablet or syrup form — children 6 years and older use adult dosage. Children 18 months to 6 years — 1/2 teaspoonful (2.5 milliliters) taken 4 times per day. Rondec-TR tablet — children 12 years and older use adult dosage, not recommended for children under 12 years. For mild cases or sensitivity — may be prescribed lower doses.
  • Missed dose: take as soon as possible, unless almost time for next dose. In that case, do not take missed dose, go back to regular schedule. Do not double doses.

Rondec Side Effects

Overdose symptoms:

no specific information about Rondec. Overdose symptoms for antihistamine and pseudoephedrine overdose: abdominal cramps, coma, convulsions, diarrhea, difficulty sleeping, difficulty urinating, dizziness, drowsiness, dry mouth, excitement, fever, flushing, fluttery heartbeat, headache, high blood pressure followed by low blood pressure, irregular heartbeat, irritability, loss of appetite, metallic taste, nausea, restlessness, talkativeness, tremor, vomiting. In children — may cause death. Other symptoms: coma, convulsions, excitement, fever, fixed and dilated pupils, flushed face, hallucinations, lack of muscle coordination, tremors. If you suspect an overdose, immediately seek medical attention.

Side effects: convulsions, diarrhea, difficulty breathing, dizziness, double vision, dry mouth, excitability in children (rare), hallucinations, headache, heartburn, increased blood pressure, increased heart rate, increased production of urine, insomnia, loss of appetite, nausea, nervousness, painful or difficult urination, pallor, sedation, stimulation, tremors, vomiting weakness.

No known less common or rare Rondec side effects.


Inform your doctor before combining Rondec with:

beta-blockers such as Tenormin and Inderal; depression medications such as Elavil and Nardil; high blood pressure medications such as Aldomet, Diupres, and Inversine; MAO inhibitors such as Nardil and Parnate; sedatives such as Halcion and Restorit tranquilizers such as Xanax and Valium.

Do not drink alcohol during Rondec therapy.

Special Cautions

If pregnant or planning to become pregnant, inform your doctor immediately. Not known if Rondec appears in breast milk.

Seniors: use with caution if over age 60.

Follow doctor’s instructions carefully for children.

  • Do not take Rondec if you are taking MAO inhibitors or if sensitive to or allergic to Rondec.
  • May cause drowsiness and impair your ability to drive a car or operate machinery. Do not take part in any activity that requires alertness.
  • Avoid Rondec if you have: asthma attack, narrow-angle glaucoma, difficulty urinating, peptic ulcer, severe high blood pressure, coronary artery disease.
  • Use with caution if you have overactive thyroid, diabetes, or enlarged prostate.

Note: provides accurate and independent information prescription pills, over-the-counter medicines and natural products. This material is provided for educational purposes only and is not intended for medical advice, diagnosis or treatment. If you have questions about  dosage, or Rondec side effects, please contact your healthcare provider