Inclusion Criteria:  Patients with a clinical diagnosis of axillary hyperhidrosis. Patients aged between 18 and 45 years old. Patients who are not being treated with another drug or treatment methodology for the disease. Patients who sign the consent form.  Exclusion Criteria:  Patients who are hypersensitive to oxybutynin hydrochloride. Patients diagnosed with glaucoma, total and partial obstruction of the intestinal tract, ulcerative colitis, megacolon and myasthenia gravis and cardiac diseases. Patients who are pregnant or intend to become pregnant. Patients who have previous indications for treatment with OX.