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What’s really in your medication
Plain-words guides to the fillers inside pills and liquids: where allergens hide, what the label does and does not have to tell you, and how to check the exact product in your hand.
7 conditions
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3 guides
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The big picture, how inactive ingredients cause reactions, and checking medicine for a child.
Hidden ingredients
Hidden ingredients in medication
Most of a pill is not the medicine. It is fillers, binders, coatings, and dyes, and a landmark study found nearly 93% of oral medications contain at least one ingredient that can trigger a reaction in a sensitive person.
8 min read · Updated July 11, 2026
Parents and kids
Allergy-safe medicine for kids
You have mastered food labels. Medication labels play by different rules. What to watch for, what to ask the pharmacist, and how to make a safer choice at 10pm with a feverish kid.
7 min read · Updated July 11, 2026
Drug reactions
Allergic to the drug or the filler?
A reaction to a medication is not always a reaction to the medicine itself. Sometimes the cause is an inactive ingredient, which matters because the same drug may be available without it.
8 min read · Updated September 25, 2026
6 guides
Labels, generics & the pharmacy
What the label does and does not tell you, why versions of the same drug differ, and your options.
Generics
Generic vs. brand-name drugs
The FDA requires a generic to match the brand’s active ingredient, not its fillers. Why two versions of the same medicine can contain different allergens, and when the rules require a closer match.
7 min read · Updated September 25, 2026
Refills
Why your refill looks different
A pill that changed color or shape often means the pharmacy switched manufacturers. The medicine is the same, but the inactive ingredients may not be. What to check before you take it.
6 min read · Updated September 25, 2026
Reading labels
How to read a drug label
Over-the-counter and prescription medications list inactive ingredients in different places. Where to find them on the Drug Facts label and in the package insert, and what the list will not tell you.
7 min read · Updated September 25, 2026
Labeling law
Why labels skip allergens
Packaged food has to declare major allergens. Prescription and over-the-counter drugs do not. The gap in federal labeling law, the few exceptions, and the ADINA Act.
7 min read · Updated September 25, 2026
Compounding
Compounded medication
When every available version of a medicine contains an ingredient you cannot take, a compounding pharmacy may be able to make one without it. How compounding works, its limits, and what to ask.
6 min read · Updated September 25, 2026
Supplements
Vitamins and supplements
Supplements follow different labeling rules than medication, including a duty to declare major food allergens. What that covers, what it misses, and the capsule and filler ingredients worth a second look.
8 min read · Updated September 25, 2026
11 guides
Common allergens & intolerances
The food, animal-derived, and other allergens people most often react to.
Gluten and celiac
Gluten in medication
Drug makers are not required to say whether a medication contains gluten. Here is how gluten gets into pills, why the label may not tell you, and how to check your exact product.
7 min read · Updated September 25, 2026
Dairy and lactose
Lactose in medication
Lactose is the single most common pill filler, found in nearly half of oral medications. What that means if you are lactose intolerant, and why it means something different if you have a true milk allergy.
6 min read · Updated July 11, 2026
Alpha-gal syndrome
Alpha-gal and medication
If a tick bite gave you a red-meat allergy, your medicine cabinet is the next place to look. Mammal-derived fillers like magnesium stearate and gelatin hide in pills, and the label never says whether they came from an animal or a plant.
8 min read · Updated July 11, 2026
Corn allergy
Corn in medication
Corn hides in medication under a dozen names you would never connect to corn: starch, dextrose, maltodextrin, and more. Why a corn allergy makes the pharmacy uniquely hard, and how to check the product in your hand.
7 min read · Updated July 11, 2026
Soy allergy
Soy in medication
Soy hides in medication as lecithin and soybean oil, from tablets to IV drips. Why most refined soy derivatives are tolerated even by people with a soy allergy, and the injectable exceptions that are not.
6 min read · Updated July 11, 2026
Nut allergies
Peanut and tree nuts in medication
Peanut oil is rare in medication, and on European and British labels it goes by the name arachis oil. What a nut allergy means for pills, capsules, and injections, and why highly refined oils are a special case.
7 min read · Updated September 25, 2026
Egg allergy
Egg in medication
Egg-derived ingredients turn up in a few medicines, and one common anesthetic has a long-running reputation among people with egg allergy. What the evidence actually says, and how to check.
6 min read · Updated September 25, 2026
Fish and shellfish
Fish and shellfish in medication
A shellfish allergy is not an iodine allergy, even though many people are still asked about it. Where fish and shellfish-derived ingredients really appear in medication and supplements, and how to check.
7 min read · Updated September 25, 2026
Sesame allergy
Sesame in medication
Sesame became the ninth major food allergen in 2023, but that labeling law covers food, not medication. Where sesame oil shows up in medicine, including some injections, and how to check.
6 min read · Updated September 25, 2026
Gelatin and capsules
Gelatin in medication
Gelatin is still the main capsule material, usually from pigs or cattle, and the label rarely says which. What that means for alpha-gal syndrome, gelatin allergy, and vegetarian, halal, or kosher diets.
6 min read · Updated September 25, 2026
Latex allergy
Latex allergy and medication
With medication, latex allergy is mainly a packaging question: natural rubber can be part of the stoppers, plungers, and needle covers that touch injectable medicine. What the labeling means, and what to tell your care team.
7 min read · Updated September 25, 2026
9 guides
Dyes, additives & other ingredients
Colorants, sweeteners, preservatives, and fillers worth knowing about.
Dyes and additives
Dyes in medication
One food dye is required by federal law to carry an allergy warning on prescription labels. Why dyes are in medication at all, which ones are documented to cause reactions, and how to find dye-free versions.
6 min read · Updated July 11, 2026
PEG and polysorbates
PEG in medication
Polyethylene glycol is in laxatives, colonoscopy prep, steroid injections, and countless pills, and allergy to it is real, sometimes severe, and often missed. What PEG is, why it is easy to overlook, and how to check.
7 min read · Updated July 11, 2026
Additives and colorants
Titanium dioxide in medication
Titanium dioxide whitens the coating on tens of thousands of pills. The EU banned it in food but kept it in medicine, and US regulators still allow both. The facts, so you can decide for yourself.
6 min read · Updated July 11, 2026
Sulfite sensitivity
Sulfites in medication
Sulfites are one of only a handful of inactive ingredients US law forces onto a drug label with a warning. Why they matter most for people with asthma, and the one life-saving exception to the rule.
6 min read · Updated September 25, 2026
Alcohol
Alcohol in medication
Some cough syrups and liquid medicines contain alcohol, and federal rules cap how much an over-the-counter medicine you swallow can contain, by age. Why it is there, who should pay attention, and how to find alcohol-free versions.
7 min read · Updated September 25, 2026
Sweeteners and PKU
Aspartame and PKU
Some chewable and dissolving tablets are sweetened with aspartame, a source of phenylalanine. Why the label has to warn people with PKU, and where to find the warning.
7 min read · Updated September 25, 2026
Sweeteners
Sugar alcohols in medication
Sugar alcohols sweeten a lot of liquid medicines and some chewables. In larger amounts they can cause bloating and diarrhea, and xylitol is dangerous to dogs. What to know and how to check.
7 min read · Updated September 25, 2026
Preservatives
Preservatives in medication
Eye drops, multi-dose vials, and some liquids and creams use preservatives to keep germs from growing. Which ones matter and for whom, from parabens to benzyl alcohol in newborns, and when preservative-free versions exist.
7 min read · Updated September 25, 2026
Dyes and additives
Red Dye No. 3 ban
The FDA ordered Red No. 3 out of food and ingested drugs in 2025, with a January 18, 2028 deadline for drug makers. What changed, why, and how to check whether a medicine contains it.
7 min read · Updated September 25, 2026
7 guides
Faith & diet
Animal-derived and other ingredients that matter for religious practice and for vegetarian or vegan diets.
Vegan and vegetarian
Vegan medication
Gelatin, lactose, carmine, shellac, and vitamin D3 can all turn up in medication. How to spot animal-derived ingredients, where the label falls short, and how to raise it with your prescriber.
7 min read · Updated September 25, 2026
Halal
Halal medication
Some medicines contain ingredients that raise halal questions, from pork-derived gelatin to alcohol in liquids. Which ingredients to look for, why the label may not say, and who to ask.
6 min read · Updated September 25, 2026
Kosher and Passover
Kosher medication
Gelatin, animal-derived fillers, and grain-derived ingredients can raise kosher and Passover questions about medication. What the ingredients are, why the label does not settle it, and who to ask.
7 min read · Updated September 25, 2026
Vegetarian
Vegetarian medication
A lacto-ovo vegetarian diet allows milk and eggs, so lactose is not the issue. Ingredients from slaughtered animals are. What to look for in capsules and tablets, which ingredients can come from plants or animals, and how to ask.
7 min read · Updated September 25, 2026
Beef-free
Beef-free medication
For people who avoid beef for religious reasons, including many Hindus and Jains, medicine is harder to check than food. Where cattle-derived ingredients can appear in capsules and tablets, what happened to cattle-derived heparin, which ingredients the label leaves ambiguous, and who to ask.
9 min read · Updated September 25, 2026
Pork-free
Pork-derived ingredients
Some medicines are not just made with pork-derived fillers; their active ingredient comes from pigs. Where porcine ingredients appear, from blood thinners to capsule shells, and what to ask if you avoid pork.
7 min read · Updated September 25, 2026
Blood products
Jehovah’s Witnesses and medication
Some injectable medicines and biologics contain human albumin, made from donated blood plasma. What jw.org says about blood components and fractions after its September 18, 2026 update, where albumin can appear, and how to check before a procedure.
8 min read · Updated September 25, 2026
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