Dutas (Dutasteride) – Patient Information (United Kingdom)

Dutas contains dutasteride, a medicine used to treat certain problems related to an enlarged prostate. This guide explains how it works, how to take it safely, what to expect, and key information for people in the UK.

Read all the information in this page and follow your healthcare professional’s advice. If you have any concerns, speak to a pharmacist or doctor.

1. Basic product information

What dutasteride does: It reduces levels of a hormone (DHT) that can drive prostate enlargement. Over time, this may improve urinary symptoms and reduce the risk of acute urinary retention and the need for prostate surgery.

Who it is for: Adults who have symptoms of an enlarged prostate (benign prostatic hyperplasia, BPH).

2. Indications (what it’s used for)

Dutas (dutasteride) is used for:

• Treatment of benign prostatic hyperplasia (BPH)—to improve symptoms linked to an enlarged prostate.
• Reducing the risk of acute urinary retention (sudden inability to urinate).
• Reducing the need for prostate surgery (such as transurethral resection) in appropriate patients.

In clinical practice, dutasteride is often considered for men with moderate to severe urinary symptoms and/or an enlarged prostate, sometimes alongside other medicines (such as alpha blockers) depending on individual needs.

3. Mechanism of action (how it works)

Dutasteride belongs to a group of medicines called 5-alpha-reductase inhibitors (5-ARIs).

In the body, testosterone is converted into dihydrotestosterone (DHT) by enzymes called 5-alpha-reductase (notably types I and II). DHT contributes to prostate growth and, over time, to worsening urinary symptoms.

• Dutasteride blocks the formation of DHT by inhibiting both 5-alpha-reductase type I and type II.
• With lower DHT levels, the prostate may shrink and urinary symptoms may improve.
• It usually works gradually rather than immediately.

4. Pharmacokinetics (how your body handles dutasteride)

Absorption: Dutasteride is absorbed after oral administration.

Protein binding: It is highly bound to plasma proteins.

Distribution: It reaches tissues including the prostate.

Metabolism: It is extensively metabolised (primarily in the liver) into metabolites that also have activity.

Half-life: Dutasteride is known for a long half-life, meaning it stays in the body for an extended period. This contributes to its once-daily dosing and sustained effect over time.

Implications for patients: Because it builds up and acts steadily, symptom improvement may take weeks to months. If you miss a dose occasionally, it usually won’t cause immediate loss of effect, but regular daily dosing is important.

5. Typical timing and how long it takes to work

When to take it: Typically once daily, at the same time each day if possible.

What to expect:

• Early changes: Some people notice improvement gradually within the first few months.
• Best effects: Maximum benefit often takes at least 6 months, and sometimes longer.
• Consistency matters: Stopping early can reduce long-term benefits.

Practical tip: If you’re using another medicine at the same time (for example, an alpha blocker), you may feel symptom relief sooner from that medicine, while dutasteride works in the background.

6. Food interactions

Dutasteride can usually be taken with or without food.

• If your stomach feels sensitive, taking it after a meal may help.
• There are no commonly highlighted food restrictions for dutasteride, but maintain a consistent routine.

7. Alcohol and medicine interactions

Alcohol

There is no specific requirement to avoid alcohol with dutasteride. However, alcohol can worsen urinary symptoms in some people (for example by increasing urine production or irritating the bladder). If you drink alcohol, monitor whether it affects your urinary symptoms.

Medicines that may interact

Dutasteride is metabolised in the liver. Some medicines may increase its levels (increasing the risk of side effects) by affecting the enzymes that break it down.

Seek advice if you take:

• CYP3A4 inhibitors or other medicines known to affect liver metabolism (for example, certain antifungals or antibiotics).
• Other prostate medicines, especially combination regimens—your prescriber/pharmacist will tailor the plan.
• Herbal products (for example, St John’s wort) — these can affect drug metabolism.

Important: Do not start, stop, or change dose of any medicine without checking with a healthcare professional. Provide your pharmacist with a full list of your medicines, including over-the-counter products and supplements.

8. Safety profile and side effects

Most people tolerate dutasteride well. Side effects often involve sexual function and breast tissue changes. Many effects are dose- and time-dependent and may reduce with continued treatment.

Common side effects

• Reduced libido (lower sex drive)
• Erectile dysfunction
• Changes in ejaculation (including reduced semen volume)
• Breast tenderness or breast enlargement (sometimes)

Less common but important reactions

• Allergic reactions (for example, rash, swelling, or difficulty breathing—seek urgent care if severe)
• Changes in mood (report if new or distressing)
• Breast lumps or nipple discharge—report promptly

Prostate cancer warning and PSA monitoring

Dutasteride lowers PSA (prostate-specific antigen) levels. PSA testing remains important, but interpretation can be affected by 5-ARIs.

• Your healthcare professional may adjust how PSA results are assessed.
• Any significant rise in PSA while on treatment may need evaluation.

Breast and testicular symptoms should be assessed by a clinician.

9. Who should not take Dutas (contraindications and cautions)

Dutasteride is intended for men. It should not be used by:

• Women (including those who are or may be pregnant)
• Children

Pregnancy and exposure risk: Dutasteride can cause harm to a developing male foetus. Capsules are meant to be handled carefully.

• Do not handle broken or leaking capsules.
• If a capsule is accidentally broken, avoid skin contact and follow local advice on safe disposal.
• Keep medicine out of reach of children.

Additional cautions: Inform your clinician if you have liver disease or any concerns about liver function, as dutasteride is processed by the liver.

10. Dosing (how to take it safely)

Usual adult dose:

• 0.5 mg once daily (capsule)

How to take:

• Swallow the capsule whole with water.
• Do not open, crush, or chew the capsule.
• Try to take it at the same time each day.

If you miss a dose:

• Take it when you remember on the same day.
• If it is close to the next dose, skip the missed dose and continue as normal.
• Do not take a double dose to make up for a missed capsule.

If you take too much:

• Seek advice promptly from NHS 111 or a healthcare professional if you believe you have taken more than recommended.

11. Practical use tips

• Give it time: Don’t judge effectiveness after only a few days. BPH improvement typically builds over months.
• Track symptoms: Consider keeping a simple log of urinary frequency, urgency, night-time waking, and weak stream.
• Don’t stop early: Stopping can lead to loss of benefits over time.
• Keep up with monitoring: Ask about PSA and regular follow-up as advised.
• Manage sexual side effects: If changes in libido or erectile function occur, discuss options—sometimes the choice of medicines or timing can be adjusted.

Storage: Store in a safe place according to the package instructions, away from excessive heat and moisture.

12. Safety checklist – when to seek help

Get urgent medical help if you have:

• Signs of a severe allergic reaction (swelling of face/lips, difficulty breathing)
• Severe rash or widespread skin reaction
• Any serious symptoms that worry you

Contact a clinician promptly if you notice:

• Breast lumps, nipple discharge, or persistent breast changes
• A new or worsening urinary problem that doesn’t improve
• Persistent sexual side effects causing distress

13. Alternative options for BPH

There are several treatment options for BPH. The most suitable choice depends on symptom severity, prostate size, PSA results, and your medical history.

Medication alternatives

• Alpha blockers (e.g., tamsulosin, alfuzosin): can improve urine flow more quickly, but they don’t shrink the prostate.
• Other 5-alpha-reductase inhibitors (for example, finasteride): similar class; may be an option depending on patient factors.
• Combination therapy: using a 5-ARI with an alpha blocker is common for selected patients with larger prostates and moderate-to-severe symptoms.

Non-medicine approaches

• Lifestyle adjustments (reducing fluid intake late in the evening, limiting alcohol/caffeine if they worsen symptoms)
• Bladder training techniques
• Procedural/surgical options if medicines are unsuitable or not effective (your clinician can discuss options such as TURP or newer minimally invasive techniques)

Important: Alternatives may have different benefits and risks. Discuss which approach best matches your symptom pattern and prostate size.

14. UK market and legal context (general information)

In the UK, medicines containing dutasteride are regulated and supplied according to UK medicines legislation and pharmacy requirements. Availability may depend on the product format, strength, and the pharmacy’s services.

Online pharmacy availability: Some online pharmacies may supply BPH medicines through established supply pathways in line with UK regulations. Always ensure you purchase from a reputable supplier and check product details against the packaging and leaflets provided.

Quality and safety: Choose suppliers that follow UK regulations for storage, handling, and dispensing. Do not accept substitutions without medical advice.

15. Recent guidance and monitoring considerations (UK-focused)

Clinical guidance for BPH generally emphasises:

• Regular review of symptoms and treatment response
• Monitoring PSA with awareness that 5-ARIs change PSA interpretation
• Assessing treatment benefits versus potential side effects (especially sexual side effects)
• Evaluating for red-flag symptoms (for example, blood in urine, suspected prostate cancer concerns, severe urinary retention)

Because clinical recommendations can evolve, your healthcare professional may follow the latest UK guidance for assessment and follow-up. If you have questions about PSA testing intervals or how your results are interpreted while on dutasteride, ask your clinician or pharmacist.

16. Delivery and availability (online pharmacy)

Availability and delivery timelines can vary by pharmacy and location across the UK. When ordering, check:

• Product details (strength, capsule count, manufacturer)
• Delivery options and estimated dispatch times
• Packaging and tamper-evident seals
• Order tracking (if offered)

Temperature and handling: Dutasteride capsules should be stored according to the leaflet instructions. If your delivery arrives damaged or excessively warm, contact the pharmacy for advice.

17. FAQ

How quickly will Dutas (dutasteride) improve my symptoms?

Dutasteride works gradually. Some improvement may be noticed within the first few months, but many people need at least 6 months for the best effect. Continue taking it daily as directed.

Can I take it with food?

Yes. Dutasteride can usually be taken with or without food. If it upsets your stomach, taking it after a meal may help.

What if I stop taking it?

Stopping can reduce the benefits over time. If you’re considering stopping, discuss it with a healthcare professional so your symptoms and risks can be reassessed.

Does dutasteride affect PSA tests?

Yes. Dutasteride typically lowers PSA levels. PSA monitoring remains important, but results may be interpreted differently when you are on a 5-ARI. Your clinician will advise how to interpret your readings.

Will dutasteride affect sexual function?

Some men experience changes such as reduced libido, erectile dysfunction, or reduced semen volume. These effects are not experienced by everyone. If side effects occur and are bothersome, talk to your pharmacist or doctor—there may be options to manage them.

Is dutasteride safe with alcohol?

There is no strict prohibition on alcohol with dutasteride. However, alcohol may worsen urinary symptoms in some people. If you drink, monitor how it affects you.

What medicines commonly interact with dutasteride?

Medicines that affect liver metabolism may change dutasteride levels. This includes some antifungals and antibiotics, and certain herbal products. Always provide a complete list of your medicines to your pharmacist.

Can women or children take dutasteride?

No. Dutasteride is intended for adult men. Women who are pregnant (or could become pregnant) must avoid exposure due to risk to a male foetus.

What should I do if a capsule is accidentally broken?

Avoid skin contact. Seek advice from a healthcare professional or follow the leaflet guidance on safe handling and disposal.

What should I do if I get breast tenderness or a lump?

Report breast changes promptly to a clinician. While some symptoms may relate to treatment, it is important to have them assessed.

Where can I get more information?

Your pharmacist can provide the patient information leaflet that comes with your medicine and answer questions about dosing, storage, side effects, and interactions.

Remember: Dutas (dutasteride) is a long-term treatment for BPH in many patients. With regular use and appropriate monitoring, it can help improve urinary symptoms and reduce certain complications of an enlarged prostate.