Over-the-counter (OTC) medicine is available without a prescription at pharmacies, grocery stores, convenience stores, and online retailers. You can walk into most stores, pick a product off the shelf, and buy it at the register. But not every OTC product works the same way, and some have purchase restrictions you should know about before heading to the store.
Where to Buy OTC Medicine
The most common places to find OTC medications are chain pharmacies like CVS and Walgreens, grocery stores with pharmacy sections, big-box retailers like Walmart and Target, and convenience stores or gas stations for basics like pain relievers and antacids. Dollar stores also carry a limited selection, often with the same active ingredients as name-brand products at a lower price.
You can also buy OTC medicine online through major retailers, pharmacy websites, and Amazon. When shopping online, look for websites verified by the National Association of Boards of Pharmacy (NABP), which launched a .pharmacy domain program to help consumers identify legitimate sellers. Their Safe Site Search Tool lets you check whether an online pharmacy is verified before you buy. Avoid unfamiliar websites with unusually low prices or no verifiable U.S. address.
Products That Require Extra Steps
Most OTC medicine sits on open shelves, but a few categories are kept behind the pharmacy counter or locked in cases. These are still technically available without a prescription, but you’ll need to take an extra step to get them.
Pseudoephedrine (Sudafed): Decongestants containing pseudoephedrine are stored behind the pharmacy counter due to federal law. You must present a government-issued photo ID to buy them, and your purchase is logged in a tracking system. There are daily and monthly limits on how much you can buy. The exact tablet count depends on the product’s dosage and formulation, so your pharmacist can tell you the specific limit for the version you need.
Cough medicine with dextromethorphan (DXM): Many states require you to be at least 18 to buy cough suppressants containing DXM, found in products like Delsym. In Washington State, for example, retailers must verify age unless the buyer reasonably appears to be 25 or older. If you look young, bring your ID.
Naloxone (Narcan): The opioid overdose reversal nasal spray was approved for OTC sale in 2023. It can be found at drug stores, grocery stores, convenience stores, gas stations, and online. No ID or age verification is required.
Newer Products You Might Not Know Are OTC
The list of what’s available without a prescription has expanded in recent years. Opill, the first FDA-approved daily birth control pill sold over the counter, is now available online and at major retailers with no doctor’s appointment needed. It’s estrogen-free and 98% effective when taken as directed.
Several allergy medications that once required prescriptions are also now OTC, including nasal steroid sprays like Flonase and Nasacort, and antihistamines like Zyrtec, Allegra, and Claritin. If you haven’t browsed the allergy aisle in a few years, you may find that what your doctor used to prescribe is now sitting on the shelf.
Common OTC Categories and What They Treat
- Pain and fever: Acetaminophen (Tylenol), ibuprofen (Advil, Motrin), naproxen (Aleve), and aspirin. Acetaminophen works differently from the others, which are anti-inflammatory drugs.
- Allergy relief: Antihistamine pills like cetirizine (Zyrtec), loratadine (Claritin), fexofenadine (Allegra), and diphenhydramine (Benadryl). Nasal sprays like fluticasone (Flonase) and budesonide (Rhinocort).
- Cold and flu: Guaifenesin (Mucinex) to thin mucus, dextromethorphan (Delsym) to suppress coughs, and pseudoephedrine (Sudafed) to relieve congestion.
- Digestive issues: Antacids, acid reducers, anti-diarrheal tablets, and laxatives.
Many cold and flu products combine several active ingredients into one pill. This is convenient but increases the risk of accidentally doubling up on a single ingredient, especially acetaminophen, which appears in dozens of combination products.
How to Read the Drug Facts Label
Every OTC product in the U.S. carries a standardized “Drug Facts” label required by the FDA. It follows the same format on every product, which makes comparison shopping easier once you know the layout. The sections appear in this order: active ingredients and their strength, the purpose of each ingredient, approved uses, warnings, directions, and other information like storage instructions.
The most important section for choosing between products is “Active ingredient.” Store-brand and name-brand products often contain the exact same active ingredient at the same strength. Comparing this line can save you significant money. A bottle of store-brand ibuprofen 200mg works identically to Advil 200mg because the active ingredient and dose are the same.
The warnings section is worth reading carefully, especially the “Do not use” and “Ask a doctor before use if you have” lines. These flag specific health conditions or other medications that could cause a dangerous interaction. The “Stop use and ask a doctor if” section lists signs that something isn’t right, like symptoms lasting longer than expected.
Safety Mistakes to Avoid
The biggest risk with OTC medicine is treating it too casually because no prescription was needed. Acetaminophen is the most common example. The maximum safe dose for adults is 4,000 milligrams per day across all products you’re taking. That ceiling is easier to hit than most people realize, because acetaminophen is an ingredient in cold medicines, sleep aids, and combination pain relievers, not just Tylenol. Taking a cold medicine and a headache pill at the same time could push you past the limit and stress your liver.
Another common mistake is combining two products with different brand names but the same type of active ingredient. Taking Advil and Aleve together, for example, stacks two anti-inflammatory drugs and raises the risk of stomach bleeding. Always check the active ingredient line before mixing products.
When a Pharmacist Can Help
Pharmacists are one of the most underused resources in a store. They can review your current prescriptions and flag potential interactions with an OTC product you’re considering. They can check whether a medication is appropriate given your health conditions, suggest a better option for your specific symptoms, or recommend a non-drug alternative when one exists.
This service is free and requires no appointment. You can walk up to the pharmacy counter at any chain and ask. It’s especially useful if you take prescription medications regularly, if you’re choosing medicine for a child, or if you’re over 65, since older adults face higher risks from certain OTC drugs like anti-inflammatories and sedating antihistamines. Pharmacists have access to your prescription profile and can spot problems like therapeutic duplication, where an OTC product contains the same type of drug you’re already taking in prescription form.