Do Prostate Enlargement Medications Affect Sexual Function?
This is the question most often asked by men starting prostate medication. The effects of alpha blockers and 5-alpha reductase inhibitors on sexual function, what reduced ejaculation means, and what to do if side effects appear.
Most men prescribed medication for benign prostatic enlargement (BPH) leave the consultation with the same concern: will these drugs affect my sex life? The question is a fair one — some prostate medications do have known effects on sexual function. However, those effects differ markedly between drug groups and most of them can be managed. What is wrong is to quietly stop the medication out of worry, or to leave the complaint unmentioned.
Which medications are used for prostate enlargement?
Three main groups come into consideration according to symptom severity and prostate volume:
- Alpha blockers: relax muscle tone in the prostate and bladder neck, easing urinary flow. They act within days and do not change the size of the prostate.
- 5-alpha reductase inhibitors (finasteride, dutasteride): shrink prostate volume by reducing production of DHT, the more potent form of testosterone. The effect emerges over months; they are preferred for larger prostates.
- PDE5 inhibitors: the drug group known from erectile dysfunction treatment; some are also used at a low daily dose for BPH symptoms.
Where overactive bladder symptoms also feature, medications that relax the bladder may be added to the programme.
How do alpha blockers affect sexual function?
An adverse effect of alpha blockers on erection is generally not expected. Their known effect is on ejaculation: the volume of semen may fall, and in some men semen travels not outwards but back into the bladder. This is called retrograde ejaculation; the man experiences orgasm but no semen emerges, and the next urine may look cloudy.
Medically this is harmless and in the great majority of cases it reverses when the drug is stopped. However, it makes natural conception more difficult in a man who wants children, so fertility status should be discussed when treatment is planned. The frequency of this effect varies by type of alpha blocker — it is more pronounced with molecules more selective for the prostate. If this complaint appears, the answer is not to stop the drug secretly but to discuss changing the molecule.
What do 5-alpha reductase inhibitors do?
Finasteride and dutasteride provide long-term benefit by shrinking the prostate and may postpone the need for surgery. Their sexual side-effect profile, however, is broader than that of alpha blockers:
- Reduced sexual desire
- Decline in erection quality
- Reduced ejaculate volume
- Breast tenderness or enlargement (less common)
These side effects occur in a proportion of patients; in most they are mild and may lessen as treatment continues. They generally reverse when the drug is stopped. In some patients complaints have been reported to persist after stopping; this picture is uncommon and debated, but it is a topic that should be discussed before starting treatment. These drugs also roughly halve the PSA value, which must be taken into account when screening for prostate cancer.
Are erectile dysfunction drugs used for the prostate?
Yes. PDE5 inhibitors taken regularly at a low dose may be preferred in suitable patients to ease lower urinary tract symptoms and address erectile difficulty at the same time. Because this allows two problems to be managed with one treatment, it is frequently considered in men with BPH who also have erectile complaints. Care is needed regarding blood pressure when combined with an alpha blocker; the decision on combination rests with the doctor.
What should be done if side effects appear?
- Do not stop the medication on your own initiative — symptoms return and the risk of urinary obstruction rises
- Describe the side effect openly; which drug causes which effect can be distinguished from the pattern
- Changing the molecule is often the first solution, particularly for ejaculatory complaints
- Dose reduction, or returning from a combination to a single drug, may be considered
- If complaints persist and prostate volume is suitable, interventional options come into consideration
Medication or intervention?
Drug treatment is not a path that must be continued for life. If symptoms persist despite medication, if side effects reduce quality of life, or if there are findings such as inability to empty the bladder, recurrent urinary infections, bladder stones or deteriorating kidney function, interventional treatment is evaluated. This field is no longer confined to classical surgery; depending on prostate volume and the patient's priorities, there are also methods with a greater potential to preserve ejaculation. The right question is not “medication or surgery” but “which step suits my prostate volume, my symptom severity and my priorities regarding sexual function”.
Assoc. Prof. Zülfü Sertkaya practises in the field of urology and andrology in Istanbul; treatment of prostate enlargement is planned individually with sexual function priorities in mind, and assessments are carried out with full confidentiality.