disintegration test

A disintegration test measures how long a tablet or capsule takes to break apart into small fragments in fluid. It is a simpler, faster check than dissolution: it tells you the dosage form falls to pieces, but not how much drug has actually dissolved.

The standard apparatus is a basket-rack holding several tubes that move up and down in a fluid (water or buffer) held near body temperature. A unit is placed in each tube, and the test records the time until no solid residue remains on the mesh, except for soft fragments. Pharmacopoeias set time limits by product type — for example, plain uncoated tablets within minutes, while enteric-coated products must resist acid for a set time then disintegrate in a higher-pH medium.

Disintegration is often a useful in-process and release control, and for some rapidly soluble products a passing disintegration test can substitute for dissolution. But disintegration into fragments does not guarantee the drug dissolves and is absorbed, so for most products dissolution remains the more meaningful performance test.