When you have a stuffy nose, a sore throat, and a cough that keeps you up all night, the last thing you want to do is read the fine print on box after box of cold medicine. But if you have irritable bowel syndrome (IBS), it’s worth turning the box over for a thorough read. A cough syrup can contain high-fructose corn syrup, and a sugar-free cough drop can contain the same sugar alcohols you’ve learned to watch out for in mints and gum. Two products with the same active ingredient can have very different formulas. In other words, while the active ingredients might not be a FODMAP issue, the rest if the formula might be.
This article is for general information only and does not replace medical advice from your healthcare provider. Before taking an over-the-counter cold or flu medicine, ask your pharmacist or healthcare provider whether it’s appropriate for you, especially if you take other medications, have a chronic health condition, or are pregnant or breastfeeding. The product examples are based on U.S. ingredient labels. Formulas can change, so check the Drug Facts label on the package you buy.
So, what can you take for a cold or the flu while following the low FODMAP diet? Start with the symptom you want to relieve, then look at both the active and inactive ingredients on the U.S. Drug Facts label.
Below are examples of what that looks like in the pharmacy aisle, including some widely available products whose labels list no obvious FODMAP ingredients. These are ingredient-based examples. The labels can tell us what’s listed in a formula, while laboratory testing would be needed to verify precise FODMAP content.
Read Both Parts of the Drug Facts Label
The active ingredient tells you what the medicine does. Acetaminophen reduces fever and relieves pain. Guaifenesin helps loosen mucus in the chest. Dextromethorphan suppresses cough. Start here to see whether the product addresses the symptom you actually have. Then check the directions and warnings to make sure it’s appropriate for you. None of these mentioned are FODMAP issues.
The inactive ingredients are where you’ll find sweeteners, flavorings, fillers, and other ingredients that help give a medicine its form, taste, or texture. This is the section to scan for FODMAPs. The ingredient list usually gives you names without amounts, so seeing sorbitol or honey on a label tells you it’s present. How much you get in a dose, and whether that amount will trigger your symptoms, are separate questions.
Which Ingredients Should You Look For?
Sugar alcohols, also called polyols. Sorbitol, mannitol, xylitol, maltitol, and isomalt are worth looking out for, especially in sugar-free lozenges, chewables, and liquid medicines. Polyols can contribute to gas, bloating, and loose stools in people who are sensitive to them. If you’re sucking on cough drops throughout the day, consider how many you’re ingesting. A single cough drop and repeated exposure across the day are different situations.
Honey and high-fructose corn syrup. Both are worth flagging if excess fructose is a known trigger for you. Ordinary table sugar, which may appear as sucrose, contains no FODMAPs. A syrup can contain both sucrose and high-fructose corn syrup, so read the whole list before deciding whether it suits you.
Lactose and added prebiotic fibers. Lactose is a FODMAP, so if it’s one of your triggers and you see it on a tablet label, ask your pharmacist whether the manufacturer can confirm the amount per dose or whether a comparable lactose-free formulation is available.
Inulin and fructooligosaccharides, sometimes abbreviated as FOS, are high FODMAP and are also worth checking labels for; they are often found in immune-support gummies and other supplements alongside your cold medicine.
For Fever, Headache, and Body Aches
Acetaminophen (like Tylenol), ibuprofen (like Motrin and Advin) and Naproxen Sodium (like Aleve) can help with the typical array of cold and flu symptoms and are low FODMAP.
Note that drugs like acetaminophen maybe be listed as an active ingredient in a product that also contains high FODMAP ingredients.
Acetaminophen turns up in combination cold and flu products. If you take it for body aches and later reach for a nighttime cold remedy, check the active ingredients first. The FDA advises against taking more than one OTC (over-the-counter) medicine containing acetaminophen at a time because too much can cause serious liver damage. Follow the directions and maximum dose on your product’s label.
Similarly, brands like “Tylenol” might have a product that is a liquid, chewable, or multi-symptom product sold under the same brand, but with its own ingredient list.
You HAVE to read labels.
For Cough and Chest Congestion
First, decide what you want the medicine to do. If thick mucus is the problem, guaifenesin is an expectorant that helps loosen it. The U.S. label for Mucinex 600 mg Extended-Release Tablets, lists guaifenesin as its sole active ingredient and shows no obvious FODMAP ingredients in the inactive list. Swallow these tablets whole as directed on the package. If you have trouble swallowing tablets, ask a pharmacist to help you find a suitable formulation.
Examples of What Not to Use
If your goal is to suppress a cough, look for dextromethorphan on the label. The sweetener depends on the product. For example, Delsym 12 Hour Cough Relief Orange lists high-fructose corn syrup alongside sucrose. Robitussin Honey Maximum Strength Cough and Chest Congestion DM lists honey, and Mucinex Children’s Fever, Sore Throat and Cough solution lists sorbitol. These examples show how much the inactive ingredients can vary from one product to the next.
Examples of What You Can Try
- Robitussin Maximum Strength Cough+Chest Congestion DM contains guaifenesin and dextromethorphan as active ingredients, with low FODMAP inactive ingredients.
- We found HealthA2Z® Mucus Relief DM, which contains guaifenesin and dextromethorphan as active ingredients, with low FODMAP inactive ingredients.
- Robohbr Cough Suppressant contains dextromethorphan as an active ingredient, with low FODMAP inactive ingredients.
If a syrup is the easiest form for you to take, ask the pharmacist to compare the exact products they stock.
For a Stuffy Nose
Plain saline nasal spray is a straightforward option when your main complaint is nasal stuffiness. The CDC includes saline nasal sprays or drops among the ways to ease common cold symptoms. Ask for plain saline if you want to avoid having to sort through the different active ingredients in medicated nasal sprays or oral decongestants.
If you’re considering an oral decongestant, ask the pharmacist about the active ingredient as well as the inactive ones. The FDA’s review found that oral phenylephrine, at the recommended OTC dose, is ineffective for nasal congestion.
In these cases, you are not only assessing FODMAP content, but efficacy.
For a Sore Throat
Cough drops and throat lozenges deserve the same label check as cough syrup. If you know sorbitol bothers you, start by looking for a lozenge without that ingredient. A lozenge sweetened with sugar can be a reasonable choice from a FODMAP perspective, provided the rest of the ingredient list works for you. Check honey-flavored varieties for actual honey, and follow the package directions on how often to use them. Some contain no honey at all—only flavorings.
A warm drink you already tolerate can also feel soothing when your throat is scratchy. If you’ve learned through reintroduction that a small amount of honey works for you, use that knowledge. If excess fructose tends to bring on symptoms, you can have the drink plain or sweeten it with a little table sugar or maple syrup.
But remember, honey is low FODMAP in small servings. Try our Low FODMAP Honey Lemon Ginger Tea.
When to Call a Clinician About Flu Symptoms
OTC products can help with symptoms such as fever and aches. If you think you have influenza and you’re at higher risk of complications, contact your healthcare provider promptly, even if your symptoms seem mild. That especially includes adults 65 and older, pregnant people, and people with certain chronic conditions.
Prescription flu antivirals work best when started within the first two days, though treatment can still help some people who start later. Seek urgent medical care for trouble breathing or other severe symptoms.
The Takeaway
If you’re standing in the cold and flu aisle with IBS, pick the product that addresses your main symptom, then turn the box over. Check the active ingredients for overlap with anything you’ve already taken, and check the inactive ingredients for your known FODMAP triggers.
If you’re in the initial Elimination Phase of the diet or the label leaves you guessing, show the pharmacist the package and ask for help comparing formulations. That gives them the exact product, strength, and dosage form to work from, which is far more useful than a brand name alone. However, be prepared to be the one responsible for the FODMAP information; do not expect the average pharmacist to know much about the diet.
