1. A thermoformed pharmaceutical dosage form having a tensile strength of at least 300 N and containing an opioid (A) is a physiologically free acid (B) free in an amount of from 0.001 to 5.0 wt. %, based on the total weight of the pharmaceutical dosage form, and polyalkylene oxide (C) having a weight average molecular weight M of at least 500,000 g / mol. 2. The pharmaceutical dosage form according to claim 1, wherein the acid (B) is multicarboxylic acid. The pharmaceutical dosage form according to claim 2, wherein the multicarboxylic acid is selected from the group consisting of maleic acid, fumaric acid, glutaric acid, malonic acid and citric acid. The pharmaceutical dosage form according to claim 1, wherein the acid content (B) is in the range of 0.005 to 2.5% by weight, based on the total weight of the pharmaceutical dosage form. The pharmaceutical dosage form according to claim 1, which contains polyalkylene glycol, where the ratio of the specific gravity of the polyalkylene oxide to polyalkylene glycol is in the range of 4.2 ± 2: 1.6. Pharmaceutical dosage form in accordance with claim 1, which contains an antioxidant. The pharmaceutical dosage form according to claim 6, wherein the antioxidant is α-tocopherol. A pharmaceutical dosage form according to claim 6 or 7, wherein the antioxidant content is in the range of 0.001 to 5.0% by weight, based on the total weight of the pharmaceutical dosage form. The pharmaceutical dosage form in accordance with claim 1, where after storage for1. Термоформованная фармацевтическая лекарственная форма, имеющая предел прочности на разрыв, составляющий, по крайней мере, 300 Н и содержащая- опиоид (А),- свободную физиологически приемлемую кислоту (В) в количестве, которое составляет от 0,001 до 5,0 мас.%, из расчета общей массы фармацевтической лекарственной формы, и- полиалкиленоксид (С), имеющий среднемассовую молекулярную массу М, составляющую, по крайней мере, 500000 г/моль.2. Фармацевтическая лекарственная форма в соответ
