How to Take Theraflu: Side Effects, Dosage
How to take Theraflu: dosage guidelines, common side effects, and precautions per OTC labeling for cold and flu symptom relief.
Not medical advice. Speak with a healthcare professional before using any medication.
Reviewed by:
Updated Feb, 15
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Information sourced from FDA-approved prescribing information and peer-reviewed medical references.
How to Take Theraflu
How to Take Theraflu
Per OTC labeling, Theraflu powder packets are dissolved in hot water for oral use. The directions below apply to standard adult formulations (e.g., Multi-Symptom, Severe Cold, Flu & Sore Throat).
- Adults and children 12 years and older: Per OTC labeling, mix 1 packet with 8 oz of hot (not boiling) water. Stir until fully dissolved and sip while warm.
- How often: Per OTC labeling, take 1 packet every 4 hours as needed.
- Maximum: Per OTC labeling, do not exceed 3 packets in 24 hours.
- Children under 12: Per OTC labeling, Theraflu powder packets are not recommended for children under 12 years.
- With or without food: Per OTC labeling, may be taken with or without food.
- Check all labels: Per OTC labeling, many combination cold and flu products contain acetaminophen. Review all product labels carefully to avoid exceeding the recommended daily acetaminophen dose from multiple sources.
If your Theraflu product is a different formulation (capsules, daytime-only, or non-drowsy), follow the dosing instructions on that specific product's package label.
Warnings Before Taking Theraflu
- Per OTC labeling: Do not use if you have severe liver disease or consume 3 or more alcoholic drinks daily, due to the acetaminophen content.
- Per OTC labeling: Do not use with other products containing acetaminophen; check all medication labels to avoid exceeding the daily limit.
- Per OTC labeling: Ask a doctor before use if you have high blood pressure, heart disease, glaucoma, thyroid disease, diabetes, or prostate enlargement, due to the decongestant content.
- Per OTC labeling: Ask a doctor before use if you are taking MAO inhibitors, antidepressants, or other prescription cold, allergy, or cough medications.
- Per OTC labeling: Ask a doctor before use if pregnant or breastfeeding.
Theraflu Side Effects
Common
Mild
Drowsiness
Per OTC labeling, drowsiness is a recognized adverse effect of antihistamine-containing Theraflu formulations. Per OTC labeling, avoid driving or operating machinery if affected. Alcohol may increase drowsiness.
Normally lasts for:
2–6 hours
Common
Mild
Dry Mouth
Per OTC labeling, antihistamine components in Theraflu may cause dry mouth as an anticholinergic effect. Staying hydrated may help reduce this effect.
Normally lasts for:
1–4 hours
Occasional
Mild
Dizziness
Per OTC labeling, dizziness is a recognized adverse effect. Per OTC labeling, if dizziness is persistent or severe, stop use and consult a doctor.
Normally lasts for:
1–3 hours
Occasional
Mild
Upset Stomach
Per OTC labeling, nausea or stomach discomfort may occur. Taking the dose with food may help reduce gastrointestinal effects.
Normally lasts for:
1–2 hours
Uncommon
Moderate
Increased Heart Rate
Per OTC labeling, the decongestant (phenylephrine) component of Theraflu may cause increased heart rate. Per OTC labeling, individuals with heart conditions should consult a doctor before use.
Normally lasts for:
30 minutes–2 hours
Occasional
Mild
Trouble Sleeping
Per OTC labeling, sleeplessness is a recognized adverse effect, particularly with formulations containing a decongestant. Per OTC labeling, if sleeplessness occurs, stop use and consult a doctor.
Normally lasts for:
2–4 hours
Contact Us for a Personalized Care Plan
Have questions about compounding? Contact Voshell's Pharmacy — we prepare patient-specific medications pursuant to valid prescriptions from your licensed prescriber.
What If You Forgot to Take Theraflu
If You Forgot to Take Theraflu
Per OTC labeling, Theraflu is taken as needed for symptom relief. If a dose is missed, take it when symptoms return or when it is time for the next dose, provided doses are spaced as directed on the product label.
- Do not double up doses to make up for a missed dose.
- Per OTC labeling, maintain the minimum interval between doses as specified on the product label.
What If You Took Too Much Theraflu
If You Accidentally Took Too Much Theraflu
Contact Poison Control immediately at 1-800-222-1222 (U.S.) if you suspect an overdose, even if no symptoms are present. Call 911 if the person is unresponsive or experiencing a medical emergency.
- Symptoms of acetaminophen overdose may include: nausea, vomiting, and delayed liver damage — acetaminophen overdose can cause serious hepatotoxicity even when initial symptoms are mild. Prompt evaluation is essential.
- Symptoms of phenylephrine (decongestant) excess may include: elevated blood pressure and cardiovascular effects.
- Do not take additional doses of Theraflu or any other acetaminophen-containing product until evaluated.
- Bring the product label or know the exact dose taken when contacting Poison Control or seeking care.
How Much Does Theraflu Cost
Theraflu Cost With Insurance
Theraflu is an over-the-counter medication. Most insurance plans do not cover OTC products. Actual costs depend on your specific plan's OTC benefits, if any. FSA/HSA funds may be applicable. Contact your insurance plan or pharmacy directly for current pricing and coverage information.
Pricing information is subject to change. This is not a guarantee of coverage or cost.
How Much Does Theraflu Cost without Insurance
Cost of Theraflu Without Insurance
The price of Theraflu varies by retailer, formulation, and package size. Store-brand or generic equivalents may be available at different price points. Contact your local pharmacy or retailer directly for current pricing. FSA/HSA funds may be used for eligible OTC medications.
Pricing information is subject to change and may vary by location and retailer.
