Benign prostatic hyperplasia (BPH) is an age-related progressive condition of the prostate gland that results in an increase in prostate size.

Although the "normal" prostate in adult men usually has a volume of 15-30 ml, a value above 30 ml is usually considered "enlarged". However, the threshold at which a prostate is considered enlarged has not been strictly defined and therefore for many physicians an enlarged prostate is a subjective finding on examination.

BPH can only be defined histologically (increase in the number of epithelial cells and stromal cells), but in clinical practice it is characterized by lower urinary tract symptoms [LUTS]. The disease leads to increased pressure in the urethra, causing resistance to urine flow, known as Bladder Outlet Obstruction (BOO). This resistance can also lead to changes in bladder function caused by the obstruction, such as overactivity of the bladder detrusor muscle or, conversely, reduced detrusor contractility. BOO can present as LUTS, infections or retention, as well as other conditions.

LUTS can be divided into storage (irritant), obstructive (urinary) and post-urinary symptoms and appear frequently causing intense discomfort, reducing the quality of life. LUTS are traditionally associated with bladder outlet resistance (BOO), most commonly when histologic BPH progresses through benign prostatic enlargement (BPE) to benign prostatic obstruction (BPO).The European Urological Association (EAU) reports that LUTS are a common problem in adult men with a significant impact on quality of life (QoL). Accordingly, he suggests the use of the a1-blocker/muscarinic receptor antagonist combination in men with moderate to severe storage symptoms, voiding symptoms and PVR < 150 ml, in order to reduce the risk of acute urinary retention and relieve irritants. (storage) symptoms, leading to an improvement in the patient's quality of life. Given the small abundance of data for patients in Greece with BPH, this study will evaluate the fixed combination of solifenacin/tamsulosin in terms of disease control and improvement of the quality of life of patients with BPH. Before enrolling in the study and before signing the consent form, patients must have already received the drug with solifenacin/tamsulosin and then they are enrolled in the observational study where the physician applies his/her standard clinical practice.

The only clearly defined risk factors for BPH are age and the presence of elevated androgens in the blood. But there are other factors that can influence the prevalence of clinical disease such as metabolic syndrome, diabetes, obesity, hypertension, diet and heredity.

Clinical BPH often occurs within the same family. If one or more first-degree relatives have had BPH, then a person is at greater risk of developing the disease. The probability of developing BPH and the rates of occurrence and progression of LUTS increase significantly with age. In a study of 278 men with an average age of 58 years, it was shown that prostate volume increased at an average rate of 0.6ml per year.

Although the severity of symptoms cannot be directly related to prostate volume, having a large prostate volume is a risk factor for developing LUTS (a larger prostate is associated with an increased risk of urinary retention).

Data support that the metabolic syndrome may influence the natural course regarding the development of BPH and BOO. Metabolic syndrome includes hypertension, dyslipidemia, glucose intolerance, obesity, and insulin resistance with compensatory hyperinsulinemia.

In a meta-analysis it was shown that the obese, the elderly, patients with low HDL cholesterol values and patients with metabolic syndrome had a significantly higher total prostate volume.

Diabetes mellitus as a cause of bladder dysfunction can manifest either as overactivity or as poor detrusor function. Diet has been reported as a risk factor for the development of BPH. High amounts of vegetables and soy products in the diet may explain the lower rate of BPH in Eastern compared to Western countries. The association of alcohol, diet, and other lifestyle factors with obstructive uropathy was investigated in a cohort of 6,581 Japanese-American men, 846 of whom were later diagnosed with BPH (after 17 years of follow-up). Total alcohol intake was inversely associated with the risk of developing obstructive uropathy or BPH (i.e., reduced risk of developing the disease).

In the present study purpose is to evaluate the symptoms of the lower urinary tract in patients with BPH; the International Prostate Symptom Score (IPSS) questionnaire will be used, which is a modification of the AUA Symptom Index by adding a question that evaluates the quality of life in relation to the disease.

Both the AUA index and the IPSS questionnaire, although not specific for BPH, prostate volume, urine flow rate, residual urine volume after voiding or bladder obstruction, have been validated and are sufficiently sensitive for be used in symptom assessment and treatment selection. Although the assessment of specific symptoms is necessary for the treatment outcome of LUTS due to BPH, it is also important to have a simpler approach that addresses the patients' perception of the severity and change of their symptoms.

The Patient Global Impression of Severity (PGI-S) questionnaire assesses the patient's overall impression of the severity of his condition due to BPH symptoms and is a record of perception of the patient in a simple, valid and easily administered manner in clinical practice. The Patient Global Impression of Change (PGI-C) is the questionnaire it assesses the patient's overall impression of the change in their condition due to a treatment choice and is widely used in studies to assess chronic pain and/or for the patient's self-assessment of the overall improvement of a treatment.

Inclusion Criteria:

• Male adult patient with moderate to severe symptoms of BPH receiving monotherapy and not responding adequately.
• Male adult patient with BPH who has fully understood the study procedures and signed an informed consent form.

Exclusion Criteria:

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Biological male adult patient

Male adult patients with moderate to severe symptoms of BPH received monotherapy and did not respond adequately and are receiving FDC of Solifenacin/Tamsulosin.