Guide March 2026 · 5 min read

Splitting tablets: which ones you may split — and which ones never

In Germany, every fourth tablet is split. The biggest misunderstanding about it: a score line does not automatically mean "splittable". Some score lines are purely decorative. And some tablets that may be split have no score line at all. The consequences range from a loss of effect to a life-threatening overdose.

The rule of thumb: what the package leaflet says applies "Tablet can be split" → splitting allowed. "Do not crush" / "swallow whole" → hands off. Nothing stated → ask your pharmacist.

These tablets must not be split

⛔ Extended-release tablets — the most dangerous mix-up

Recognizable by the addition "retard", "long", "SR", "XR", "XL" or "uno" in the name. They release their active ingredient slowly over many hours. If you break them, the entire dose is released all at once — instead of spread over 12–24 hours.

Consequences: with painkillers (oxycodone retard, tramadol retard): respiratory depression, loss of consciousness — potentially fatal. With nifedipine retard: an uncontrolled drop in blood pressure. With heart medications: severe arrhythmias.

Exception: some matrix extended-release tablets may be split (but not crushed) — this is always stated in the package leaflet.

⚠ Enteric-coated tablets

The coating protects the active ingredient from stomach acid — it is meant to act only in the intestine. Splitting destroys this protection: the active ingredient dissolves already in the stomach, becomes ineffective or irritates the gastric mucosa.

Affected: many pantoprazole generics, omeprazole tablets (not the MUPS form), certain antibiotics.

⚠ Film-coated tablets and dragées with a protective coating

The coating protects against light, moisture or oxygen — or masks an extremely bitter taste. Splitting destroys the protection and often makes taking it unpleasant. If the package leaflet does not explicitly say "splittable" → do not split.

⚠ Very small tablets (under 6 mm)

Splitting them exactly is practically impossible — the halves come out different sizes. With medications with a narrow therapeutic index (levothyroxine, cardiac glycosides, blood thinners), even small deviations in dose can be dangerous.

Which tablets can you usually split?

Uncoated tablets with a deep score line — when the package leaflet explicitly allows it. Typical examples:

It also saves money A pack of bisoprolol 5 mg to halve is often cheaper than the same amount of 2.5 mg tablets. Some doctors deliberately prescribe the higher dose for splitting — this is common, safe practice.

Splitting correctly: how to do it

  • 1
    Use a tablet splitter — clearly better than a knife or your fingers. Available at any pharmacy for a few euros. Produces more even halves than any other method.
  • 2
    Domed tablets: place the score line facing up on a firm surface and press evenly from above with your thumb — the tablet breaks at the predetermined breaking point.
  • 3
    Split first, then take it right away. Store the second half dry and protected from light — do not keep it for weeks or months. The exposed active ingredient is open to light and moisture.
  • 4
    No knife, no spoon, no biting. Knives produce uneven pieces. Biting destroys the tablet structure — and some active ingredients taste extremely bitter without the coating.

Alternatives to splitting

If a tablet is too large or must not be split, there are options:

  • A different dosage form: many active ingredients come as drops, a liquid or orodispersible tablets — ask your pharmacist.
  • A different dose strength: instead of half a 10 mg tablet, there may be a 5 mg tablet. Often cheaper than you think.
  • Swallowing aids: special gels from the pharmacy coat the tablet with a slippery layer — large tablets then go down much more easily.
  • The pharmacy makes capsules: with a doctor's prescription, the pharmacy can put the active ingredient into more easily swallowable capsules (individual compounding).

Common questions

Not automatically. There are decorative score lines that serve only to distinguish a tablet from others. Only if the package leaflet explicitly allows splitting may you do it. When in doubt: ask your pharmacist.
In most cases no — there is a risk of an uncontrolled, potentially dangerous release of the active ingredient. Some matrix extended-release tablets are splittable as an exception. This is always stated in the package leaflet. When in doubt: ask your pharmacist.
With medications with a wide therapeutic window (e.g. ibuprofen): barely a problem. With medications with a narrow therapeutic window (levothyroxine, cardiac glycosides, blood thinners): a dangerous over- or underdose is possible.
Yes, but briefly. Store the second half dry, protected from light and labelled. Do not keep it for weeks or months — the unprotected active ingredient can change.
Ask your pharmacist about alternative dosage forms (drops, a liquid, orodispersible tablets) or about swallowing aids — special gels make the tablet slippery. Only mix tablets into food if the package leaflet allows it.
Often yes. A pack of bisoprolol 5 mg to halve is often cheaper than the same amount of 2.5 mg tablets. Some doctors deliberately prescribe the higher dose for splitting — this is common and safe practice, as long as the tablet is splittable.

Always on top of the exact dose

"Half a bisoprolol tablet in the morning" — brite reminds you of the exact dose. No more mixing up a whole and a half tablet.

Set up a reminder
Medical disclaimer: This page does not replace medical or pharmaceutical advice. If you are unsure whether your tablet may be split, ask at the pharmacy. As of: March 2026.