Cold and Flu OTC: A Pharmacist's Decision Guide

Cold or flu

Colds and flu overlap but the patterns differ. Colds tend to have gradual onset, prominent runny nose and sore throat, mild fever, and minimal body aches. Flu tends to have abrupt onset, prominent fever, significant body aches, fatigue, and cough. If you are within 48 hours of symptom onset and the illness looks like flu, antiviral prescription medications may shorten the course. Otherwise, treatment is symptom management.

Fever and body aches

Acetaminophen and ibuprofen both work. Choose based on your other health conditions. Acetaminophen is first line for patients with blood pressure issues, cardiovascular disease, kidney disease, or stomach problems. Ibuprofen is appropriate for most other adults if used at standard doses for short periods.

Track total daily acetaminophen across all products. Many cold and flu combination products contain acetaminophen, and stacking them with extra Tylenol can exceed the safe daily limit.

Nasal congestion

Pseudoephedrine (behind the counter) works well but raises blood pressure and is not for everyone. Oxymetazoline nasal spray works fast but causes rebound if used more than 3 days. Saline nasal sprays and rinses are useful adjuncts. Oral phenylephrine has been shown to be ineffective at standard OTC doses.

Runny nose

First generation antihistamines like chlorpheniramine and diphenhydramine help with the runny nose of a cold, but they cause significant sedation. For most adults, the trade off is rarely worth it during the day. Reserve for bedtime if needed.

Cough

For a dry, irritating cough, dextromethorphan (DM) is the standard OTC suppressant. Modest effect for most patients. For a productive cough with thick mucus, guaifenesin helps thin secretions. The combination is in many products.

Honey at bedtime has been shown in studies to reduce nighttime cough in children over age 1 and in adults. Do not give honey to infants under 12 months.

Sore throat

Throat lozenges, warm salt water gargles, and an analgesic like acetaminophen or ibuprofen handle most sore throats. Benzocaine sprays and lozenges provide temporary numbing but should not be used in children under 2.

What does not change cold duration

• Vitamin C, taken after symptoms have started, has not been shown to shorten cold duration meaningfully.
• Echinacea, zinc lozenges, and elderberry have mixed evidence. Zinc lozenges started within the first day may modestly shorten cold duration.
• Antibiotics do not treat viral colds or flu.
• Most cough and cold products do not change how long the illness lasts. They manage symptoms.

When to see a clinician

• High fever lasting more than 3 days.
• Symptoms that improve and then worsen (possible secondary bacterial infection).
• Difficulty breathing or chest pain.
• Severe sinus or facial pain.
• Symptoms in a young infant or someone with significant chronic conditions.
• Symptoms in pregnancy.

When to talk to a pharmacist

• You take blood pressure medications and need a decongestant.
• You take warfarin or another anticoagulant.
• You have diabetes and need a cold product.
• You are pregnant or breastfeeding.
• You are buying for a child under 6.

This article is for general information only and is not a substitute for personalized medical advice. Before starting or changing any medication, including over the counter products and supplements, talk with your pharmacist or physician about your specific situation.