Relieving symptoms of sinus congestion, sinus pressure, runny nose, and sneezing due to colds, upper respiratory infections, and allergies. It may also be used for other conditions as determined by your doctor.

Dynahist ER sustained-release capsules are an antihistamine and decongestant combination. The antihistamine works by blocking the action of histamine, which helps reduce symptoms such as watery eyes and sneezing. The decongestant promotes sinus and nasal drainage, relieving congestion and pressure.

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  • Examples include Dynahist ER and Histade CR
  • Constipation; diarrhea; dizziness; drowsiness; excitability; headache; loss of appetite; nausea; nervousness or anxiety; trouble sleeping; upset stomach; vomiting; weakness.

    Seek medical attention right away if any of these SEVERE side effects occur:
    Severe allergic reactions (rash; hives; itching; difficulty breathing; tightness in the chest; swelling of the mouth, face, lips, or tongue); difficulty urinating or inability to urinate; fast or irregular heartbeat; hallucinations; seizures; severe dizziness, lightheadedness, or headache; tremor; vision changes.
  • Usual Adult Dose for Allergic Rhinitis Chlorpheniramine-pseudoephedrine 2 mg-15 mg oral tablet, chewable: 2 tablets orally every 4 to 6 hours. Chlorpheniramine-pseudoephedrine 2 mg-30 mg oral tablet, chewable: 2 tablets orally every 4 to 6 hours not to exceed 4 doses per day. Chlorpheniramine-pseudoephedrine 4 mg-30 mg oral tablet, chewable, extended release: 1 to 2 tablets orally every 12 hours. Chlorpheniramine-pseudoephedrine 5 mg-75 mg/5 mL oral suspension, extended release: 10 to 20 mL orally every 12 hours not to exceed 40 mL daily. Chlorpheniramine-pseudoephedrine tannate 4 mg-30 mg oral tablet, chewable, extended release: 1 to 2 tablets orally every 12 hours.