Oral forms of administration of propiverine or its pharmaceutically acceptable salts with prolonged release of active substance.

Forms of oral administration of propiverine or its pharmaceutically acceptable salts with prolonged release of the active substance. Thanks to an appropriate delay, oral administration pharmaceutical compositions are prepared containing from 4 to 60 mg of propiverine or one or more of its pharmaceutically acceptable salts and have a prolonged release of the active substance. To do this, preferably, a mixture of active substance is coated and at least one or more acidic substances having a pka value of less than 6.65 with a retarding coating or housed in a matrix and optionally it is coated with other retarding layers .