Silodyx

Active Substance: silodosin
Common Name: silodosin
ATC Code: G04CA04
Marketing Authorisation Holder: Recordati Ireland Ltd.
Active Substance: silodosin
Status: Authorised
Authorisation Date: 2010-01-29
Therapeutic Area: Prostatic Hyperplasia
Pharmacotherapeutic Group: Urologicals

Therapeutic Indication

Treatment of the signs and symptoms of benign prostatic hyperplasia (BPH).

What is Silodyx?

Silodyx is a medicine that contains the active substance silodosin. It is available as capsules (4 and 8 mg).

What is Silodyx used for?

Silodyx is used to treat the symptoms of benign prostatic hyperplasia (BPH, an enlarged prostate gland) in adults. The prostate gland is an organ found at the base of the bladder in men. When enlarged, it can cause problems with the flow of urine.

The medicine can only be obtained with a prescription.

How is Silodyx used?

The recommended dose is one 8-mg capsule once a day. For men with moderate kidney problems, the starting dose should be 4 mg once a day. This may be increased to 8 mg once a day after a week.

Silodyx is not recommended for patients with severe kidney problems.

The capsules should be taken with food, preferably at the same time every day. They should be swallowed whole, preferably with a glass of water.

How does Silodyx work?

The active substance in Silodyx, silodosin, is an alpha-adrenoreceptor antagonist. It works by blocking receptors called alpha1A adrenoreceptors in the prostate gland, the bladder and the urethra (the tube that leads from the bladder to the outside of the body). When these receptors are activated, they cause the muscles controlling the flow of urine to contract. By blocking these receptors, silodosin allows these muscles to relax, making it easier to pass urine and relieving the symptoms of BPH.

How has Silodyx been studied?

The effects of Silodyx were first tested in experimental models before being studied in humans.

Silodyx has been compared with placebo (a dummy treatment) in three main studies involving over 1,800 men with BPH. One of these studies also compared Silodyx with tamsulosin (another medicine used for BPH).

The main measure of effectiveness in all three studies was the improvement of the patients’ international prostate symptom score (IPSS) after 12 weeks of treatment. IPSS is a rating of the patient’s symptoms such as the inability to empty the bladder, and the urge to urinate repeatedly or to strain while urinating. The patients rated the severity of their symptoms themselves.

What benefit has Silodyx shown during the studies?

Silodyx was more effective than placebo and as effective as tamsulosin at reducing symptoms of BPH.

In the two studies where Silodyx was compared only with placebo, the IPSS was around 21 points at the start of the study. After 12 weeks, it had fallen by around 6.4 points in the men who took Silodyx, and by around 3.5 points in the men who took placebo. In the third study, IPSS was around 19 points before treatment, falling by 7.0 points in the men who took Silodyx after 12 weeks, 6.7 points in the men who took tamsulosin and 4.7 points in the men who took placebo.

What is the risk associated with Silodyx?

The most common side effect with Silodyx (seen in more than 1 patient in 10) is a reduction in the amount of semen released during ejaculation. Intra operative floppy iris syndrome (IFIS) occurs in some patients taking alpha adrenoreceptor antagonists and may lead to complications during cataract surgery. IFIS is a condition that makes the iris floppy. 

For the full list of all side effects and restrictions with Silodyx, see the package leaflet.

Why has Silodyx been approved?

The CHMP decided that Silodyx’s benefits are greater than its risks and recommended that it be given marketing authorisation.

What measures are being taken to ensure the safe and effective use of Silodyx?

The company that makes Silodyx will ensure that eye surgeons are provided with information on IFIS in all Member States where the medicine will be marketed.

A risk management plan has been developed to ensure that Silodyx is used as safely as possible. Based on this plan, safety information has been included in the summary of product characteristics and the package leaflet for Silodyx, including the appropriate precautions to be followed by healthcare professionals and patients.

In addition, the company that makes Silodyx will ensure that eye surgeons are provided with information on IFIS in all Member States where the medicine will be marketed.

Other information about Silodyx

The European Commission granted a marketing authorisation valid throughout the European Union for Silodyx on 29 January 2010.

For more information about treatment with Silodyx, read the package leaflet (also part of the EPAR) or contact your doctor or pharmacist.

Source: European Medicines Agency

Disclaimer: Every effort has been made to ensure that the information provided here is accurate, up-to-date and complete, but no guarantee is made to that effect. Drug information contained herein may be time sensitive. This information has been compiled for use by healthcare practitioners and consumers in the United States. The absence of a warning for a given drug or combination thereof in no way should be construed to indicate that the drug or combination is safe, effective or appropriate for any given patient. If you have questions about the substances you are taking, check with your doctor, nurse or pharmacist.

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