📚 Module Overview
Benign Prostatic Hyperplasia (BPH) and Erectile Dysfunction (ED) are two of the most common conditions affecting men as they age. They frequently coexist and their treatments can interact, making a holistic understanding essential for pharmacists. This module provides a clear, evidence-based guide to the assessment and management of both conditions in UK primary care.
Learning Objectives
- Differentiate between the storage and voiding symptoms of BPH.
- Outline the NICE-recommended treatment pathway for BPH.
- Counsel patients on the key side effects and monitoring for alpha-blockers and 5-ARIs.
- Explain the UK's prescribing rules for ED treatments, including the Selected List Scheme (SLS) and OTC availability.
- Confidently advise on the first-line choice of PDE5 inhibitor and subsequent management.
- Identify critical contraindications and drug interactions for ED medications.
- Apply knowledge to complex clinical scenarios involving co-prescribing.
prostate Benign Prostatic Hyperplasia (BPH)
BPH causes Lower Urinary Tract Symptoms (LUTS) due to the benign enlargement of the prostate gland, which obstructs urine flow from the bladder.
Assessment & Diagnosis
Assessment involves a history, a digital rectal examination (DRE) to assess prostate size and rule out cancer, and a urine dipstick. The International Prostate Symptom Score (IPSS) questionnaire is used to quantify symptom severity. LUTS are categorised as:
- Voiding (Obstructive) Symptoms: Hesitancy, weak or intermittent stream, straining, terminal dribbling, incomplete emptying.
- Storage (Irritative) Symptoms: Urgency, frequency, nocturia, urge incontinence.
🚨 BPH Red Flags
Refer urgently if a patient presents with:
- Suspected prostate cancer (e.g., hard, nodular prostate on DRE; significantly elevated PSA).
- Acute urinary retention (a medical emergency).
- Visible haematuria.
- Recurrent UTIs or bladder stones.
- Renal impairment suspected to be due to bladder outflow obstruction.
💊 Pharmacological Management of BPHNICE CKSBNF
Drug treatment is offered to men with moderate-to-severe LUTS (IPSS score ≥8) after a period of lifestyle advice and watchful waiting.
| Drug Class | Examples & Doses | Mechanism & Onset | Key Counselling & Alerts |
|---|---|---|---|
| First-Line |
Alpha-blockers
|
Relaxes smooth muscle in the prostate and bladder neck. Fast onset (works within days). |
|
| For Large Prostates or Progression Risk |
5-alpha-reductase inhibitors (5-ARIs)
|
Blocks conversion of testosterone to dihydrotestosterone, shrinking the prostate. Slow onset (takes up to 6 months for full effect). Reduces risk of retention/surgery. |
|
| Combination Therapy |
Alpha-blocker + 5-ARI
|
Offers fast symptom relief from the alpha-blocker plus long-term disease modification from the 5-ARI. |
|
| For Overactive Bladder Symptoms |
Antimuscarinics / Beta-3 Agonists
|
Can be added to an alpha-blocker if storage symptoms (urgency, frequency) persist. |
|
⚡ Erectile Dysfunction (ED)
ED is the persistent inability to attain or maintain an erection sufficient for satisfactory sexual performance. It is a common condition and an important marker for underlying cardiovascular disease.
Assessment & Causes
Assessment should include lifestyle (smoking, alcohol, exercise), psychosexual factors, and a cardiovascular risk assessment. Many common medications can cause or worsen ED (e.g., thiazide diuretics, beta-blockers, SSRIs).
NHS Prescribing Rules Explained
Prescribing for ED on the NHS is complex. Here's a summary:
- Generic Sildenafil: This is the exception. Since 2014, GPs can prescribe generic sildenafil on an NHS prescription to any man with ED, regardless of the cause.
- Selected List Scheme (SLS): ALL other oral ED drugs (Tadalafil, Vardenafil, branded Viagra®) and other treatments (e.g., vacuum pumps) are subject to the SLS. This means they can only be prescribed on the NHS if the patient has one of a specific list of medical conditions. The prescription must be endorsed 'SLS'.
- SLS Conditions Include: Diabetes, multiple sclerosis, Parkinson's disease, poliomyelitis, prostate cancer, prostatectomy, radical pelvic surgery, severe pelvic injury, spinal cord injury, spina bifida, and renal failure requiring dialysis.
- OTC Supply: Sildenafil 50mg (Viagra Connect®) and Tadalafil 10mg (Cialis Together®) can be sold over-the-counter by a pharmacist after a clinical assessment.
💊 Pharmacological Management of EDNICE CKSBNF
Phosphodiesterase-5 (PDE5) inhibitors are first-line treatment. They require sexual stimulation to work.
🚨 ABSOLUTE CONTRAINDICATION
PDE5 inhibitors must NEVER be used in patients taking nitrates (e.g., GTN, isosorbide mononitrate) or nicorandil due to the risk of profound, life-threatening hypotension.
| Drug | Dosing & Onset | Key Features & Counselling |
|---|---|---|
| First-Line |
Sildenafil
|
|
| Second-Line (or if preferred) |
Tadalafil
|
|
Managing Treatment Failure & Cautions
- Trial: A patient is only considered a non-responder after trying at least 6-8 doses at the maximum tolerated strength.
- Alpha-blockers: Use PDE5 inhibitors with caution in patients on alpha-blockers due to risk of postural hypotension. Advise separating the doses (e.g., tamsulosin in the morning, sildenafil in the evening). Start with the lowest PDE5 inhibitor dose.
🎯 OSCE Preparation
Counselling a patient starting Sildenafil who also takes Tamsulosin
Scenario: Mr. Smith, 62, has been prescribed Sildenafil 50mg for the first time. You see he also takes Tamsulosin 400mcg in the morning for BPH.
Key Communication & Counselling Steps:- Check Understanding: "Hello Mr. Smith. Before we go through this new medication, can you tell me what the doctor has told you it's for?"
- Explain Mechanism Simply: "Sildenafil works by increasing blood flow to the penis, but it's important to know it only works when you are sexually aroused. It won't cause an erection on its own."
- Instructions for Use: "You should take one tablet about an hour before you plan to have sex. Try to avoid taking it with a heavy, fatty meal as that can slow it down. The effects can last for about 4 to 6 hours."
- Address the Interaction: "I can see you take Tamsulosin for your prostate. Both medicines can lower your blood pressure, so taking them together can sometimes make you feel dizzy or light-headed. To reduce this risk, it's best to leave a gap between them. Since you take your Tamsulosin in the morning, I'd suggest you plan to take the Sildenafil in the evening."
- Side Effects: "Common side effects can include headache, feeling flushed, or indigestion. These usually wear off. Have you been told about any serious side effects to watch out for?" (Check for red flag counselling, e.g., priapism).
- Safety Netting & Teach-Back: "The most important thing is to never take this with any nitrate medications for chest pain, like a GTN spray. If you were to get chest pain, you must tell the paramedics you have taken sildenafil. To make sure I've been clear, can you tell me when would be the best time to take this, considering your other medication?"
⭐ Bonus: Clinical Pharmacist Case Study
The Patient: Doxazosin and Tamsulosin overlap
Patient Profile: A GP practice asks you to review the medications for Mr. Evans, a 72-year-old man. His prescriptions include Doxazosin 4mg OD and Tamsulosin MR 400mcg OD. His blood pressure is well-controlled at 130/80 mmHg.
Pharmacist's Intervention (SOAP Note Format)
- Subjective: Medication review requested by GP.
- Objective: Patient is prescribed two alpha-blockers concurrently: Doxazosin (non-selective) and Tamsulosin (uro-selective). BP is at target.
- Assessment: The concurrent prescribing of two alpha-blockers is a therapeutic duplication. While Doxazosin treats both hypertension and BPH, and Tamsulosin is more specific for BPH, using both increases the risk of side effects like postural hypotension, dizziness, and falls, without providing significant additional benefit for LUTS. The patient's BPH symptoms are likely being managed effectively by just one of these agents.
- Plan:
- Identify Primary Indication: Contact the GP to clarify the original indication for the Doxazosin. Was it started for hypertension or BPH?
- Recommend Streamlining:
- If Doxazosin was for hypertension: Recommend stopping the Tamsulosin. Doxazosin will provide benefit for both conditions. This simplifies the regimen and reduces pill burden.
- If Doxazosin was for BPH: It's likely the Tamsulosin was added later. Recommend stopping the Doxazosin and monitoring BP. If BP increases, a different class of antihypertensive (e.g., an ACE inhibitor or CCB as per NICE guidelines) should be initiated, as Tamsulosin has minimal effect on blood pressure. This provides more targeted therapy for each condition.
- Patient Counselling: Once a plan is agreed, counsel the patient on the change, explaining that it is to make their medication regimen safer and more effective, and what monitoring (e.g., BP checks) is required.