Strength: What the number on your pill really means

You’ve seen a number on a bottle or blister pack and wondered: does a higher number mean a stronger effect or just more risk? That number is the drug strength — usually milligrams (mg) or micrograms (mcg). It tells how much active drug is in each unit, not how quickly it works or whether it’s safe for you. Knowing how strength, frequency, and formulation work together helps you use meds smarter and safer.

How to pick the right strength

First, follow the prescription or label. Doctors pick strength based on your age, weight, kidney and liver function, and condition. For example, common OTC ibuprofen (Motrin) is 200 mg per tablet, while prescription pain meds may come in 400 mg or 800 mg options. Some drugs like rivaroxaban have dose strengths tied to a condition — 10 mg for prevention, 20 mg after a clot. Inhalers use mcg per puff, so you’ll see numbers like 90 mcg for albuterol.

Think in totals: strength × number of doses per day = total daily dose. A 50 mg tablet twice a day is different from a single 100 mg tablet — sometimes the same total, sometimes not, because of how the drug releases. Extended-release tablets shouldn’t be split. Liquid medicines use mg per mL; for kids, dosing by weight (mg/kg) matters. When switching brands or strengths, check whether the formulation is immediate-release or extended-release before you change how often you take it.

Common mistakes and quick safety tips

People mix up strength with potency. Higher mg doesn’t automatically mean stronger effect for every person. Watch for lookalike pills — use the imprint code on the tablet or the pharmacy label to confirm. Don’t split pills that are coated, extended-release, or shown by the label not to be split. For liquids, use the dosing syringe or cup that comes with the medicine; kitchen teaspoons are unreliable.

Buying meds online? Use only licensed pharmacies that require a prescription for prescription drugs. Check for contact info, a pharmacist line, and secure checkout. Articles here explain how to pick safe online pharmacies and what red flags to avoid when ordering.

Store meds in the original container away from heat and moisture. If a medicine changes color, smells odd, or has visible damage, don’t take it — ask your pharmacist. Dispose of unused meds at take-back programs or follow local disposal rules.

Final checklist before taking any medication: did a clinician confirm the dose? Is the strength and frequency written clearly? Is this the right formulation (tablet, liquid, inhaler)? If you’re not sure, call your pharmacist — they can confirm strength, explain labels, and spot dangerous mixes with other drugs you take.

Knowing what the number on a pill means saves mistakes. Strength is one piece of the puzzle — pair it with the right schedule, form, and professional advice and you’ll be using meds more safely and effectively.