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What the medicine is used for
Theraflu Daytime Dry Syrup, an over-the-counter medicine sold by Haleon Korea, is intended to relieve multiple cold symptoms, including a runny or stuffy nose, sneezing, sore throat, chills, fever, headache, and joint and muscle pain. The product is listed in the medication database maintained by South Korea’s Ministry of Food and Drug Safety.
Dosage and preparation
Adults and adolescents ages 12 and older may take one packet as needed every four to six hours, but should not take more than four packets within 24 hours. Each packet should be dissolved in about 250 milliliters of hot, but not boiling, water and consumed within 10 to 15 minutes. Users should follow the labeled dose and directions.
Acetaminophen and alcohol warnings
The medicine contains acetaminophen and should not be taken with other products containing the same ingredient. Total acetaminophen intake should not exceed 4,000 milligrams a day because higher doses can cause liver damage. People who regularly consume three or more alcoholic drinks a day should consult a doctor or pharmacist before taking this or another fever reducer or pain reliever.
Rare but potentially fatal skin reactions, including acute generalized exanthematous pustulosis, Stevens-Johnson syndrome and toxic epidermal necrolysis, have been reported. Anyone who develops a rash or another sign of an allergic reaction should stop taking the medicine immediately.
Who should not take it
The product should not be used by people with an allergy to its ingredients; aspirin-induced asthma; severe heart failure, high blood pressure, peptic ulcers, blood disorders, liver or kidney disease; diabetes; epilepsy; glucose-6-phosphate dehydrogenase deficiency; pheochromocytoma; or certain inherited conditions affecting the digestion of galactose or lactose. It also should not be taken by people currently using monoamine oxidase inhibitors, a class that includes some antidepressant, psychiatric and Parkinson’s medications, or by those who stopped taking such a drug within the previous two weeks.
People should consult a doctor or pharmacist before use if they have Raynaud syndrome or another obstructive vascular disorder, a tendency toward allergic reactions, liver or kidney problems, a history of peptic ulcers or blood abnormalities, a bleeding tendency, emphysema, asthma, chronic bronchitis, a cough with substantial mucus, thyroid disease, an enlarged prostate, glaucoma or preeclampsia. The same guidance applies to people on a sodium-restricted diet, older adults, those with a high fever or sensitivity to Yellow No. 5, and people who are pregnant, may be pregnant or are breastfeeding.
Interactions and reasons to stop use
The medicine should not be combined with other cold remedies, cough and expectorant medicines, acetaminophen products, fever reducers, pain relievers, sedatives, antihistamines or other sympathomimetic drugs. The Korean labeling also lists interactions with tricyclic antidepressants, blood pressure medicines, barbiturates, metoclopramide, domperidone, cholestyramine, warfarin and other coumarin anticoagulants, chloramphenicol, zidovudine, probenecid, digoxin and other cardiac glycosides, and ergot alkaloids such as ergotamine and methysergide. Patients taking flucloxacillin should consult a doctor or pharmacist.
The medicine may cause drowsiness, dizziness, impaired vision, or cognitive and psychomotor problems, so users should use caution when driving or operating machinery. Other reported effects include dry mouth, fatigue, headache, insomnia, irritability, nervousness, rapid heartbeat, palpitations, sleep problems, constipation, diarrhea and abdominal bloating.
Users should stop taking the medicine and seek advice from a doctor or pharmacist if they experience a severe skin reaction, breathing difficulty, widespread redness, swelling, hives, facial swelling, low blood pressure, shock, unusual bleeding, blood disorders, nausea, loss of appetite, gastrointestinal bleeding, ulcers or perforation, difficulty or pain with urination, raised blood pressure, an unusually slow heartbeat, dilated pupils, excessive cooling or collapse. Medical advice is also recommended if a severe sore throat lasts more than two days or occurs with fever, headache, rash, nausea or vomiting.
Storage and medical guidance
The packets should be stored below 25 degrees Celsius, protected from moisture and light, and kept out of children’s reach. The information is based on public medication data from South Korea’s Ministry of Food and Drug Safety and does not replace a medical diagnosis or prescription. Patients should review the full approved labeling and consult a doctor or pharmacist before use.
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