Generic Name: silodosin (SIL oh DOE sin)
Brand Names: Rapaflo
Medically reviewed on November 20, 2017.
What is Rapaflo?
Rapaflo (silodosin) is an alpha-adrenergic (AL-fa ad-ren-ER-jik) blocker.
Rapaflo helps relax the muscles in the prostate and bladder neck, making it easier to urinate.
Rapaflo is used to improve urination in men with benign prostatic hyperplasia (enlarged prostate).
You should not take Rapaflo if you have severe kidney or liver disease.
Do not take silodosin together with similar medicines such as alfuzosin, doxazosin, prazosin, tamsulosin, or terazosin.
Rapaflo may cause dizziness or fainting, especially when you first start taking it. Be careful if you drive or do anything that requires you to be alert. Avoid standing for long periods of time or becoming overheated during exercise and in hot weather. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy.
Rapaflo can affect your pupils during cataract surgery. Tell your eye surgeon ahead of time that you are using Rapaflo. Do not stop using Rapaflo before surgery unless your surgeon tells you to.
There are many other drugs that can interact with silodosin. Tell your doctor about all medications you use.
Before taking this medicine
You should not take Rapaflo if you are allergic to silodosin, or if you have:
severe liver disease; or
severe kidney disease.
Some medicines can interact with silodosin and should not be used at the same time. Your doctor may need to change your treatment plan if you use any of the following drugs:
an antibiotic - clarithromycin, telithromycin;
antifungal medicine - itraconazole, ketoconazole, posaconazole, voriconazole;
heart medication - nicardipine, quinidine;
antiviral medicine to treat hepatitis C or HIV/AIDS - atazanavir, boceprevir, cobicistat, delavirdine, fosamprenavir, indinavir, nelfinavir, ritonavir, saquinavir, telaprevir; or
medicines similar to Rapaflo - alfuzosin, doxazosin, prazosin, tamsulosin, or terazosin.
To make sure Rapaflo is safe for you, tell your doctor if you have:
low blood pressure;
kidney disease (or if you are on dialysis);
a history of prostate cancer;
a condition for which you take a diuretic or "water pill"; or
if you are on a low-salt diet.
Rapaflo can affect your pupils during cataract surgery. Tell your eye surgeon ahead of time that you are using this medicine.
Although Rapaflo is not for use in women, this medicine is not expected to harm an unborn baby or a nursing baby. If you are a woman and you take silodosin, tell your doctor if you are pregnant or breast-feeding.
Rapaflo is not approved for use by anyone younger than 18 years old.
How should I take Rapaflo?
Take Rapaflo exactly as prescribed by your doctor. Follow all directions on your prescription label. Your doctor may occasionally change your dose to make sure you get the best results. Do not use this medicine in larger or smaller amounts or for longer than recommended.
Rapaflo is usually taken once daily with a meal. Follow your doctor's dosing instructions very carefully.
Rapaflo lowers blood pressure and may cause dizziness or fainting, especially when you first start taking it. You may feel very dizzy when you first wake up. Avoid getting up too fast from a sitting or lying position, or you may feel dizzy. Get up slowly and steady yourself to prevent a fall.
While using this medicine, your blood pressure and prostate will need to be checked often.
Some things can cause your blood pressure to get too low. This includes vomiting, diarrhea, or heavy sweating. Call your doctor if you have a prolonged illness that causes diarrhea or vomiting.
Store at room temperature away from moisture, heat, and light.
Rapaflo dosing information
Usual Adult Dose for Benign Prostatic Hyperplasia:
8 mg orally once a day with a meal
Comments: Patients who have difficulty swallowing may open the capsule and sprinkle the powder on a tablespoonful of applesauce. The applesauce should not be hot, and should be soft enough to be swallowed within 5 minutes without chewing and followed with 8 ounces of cool water.
See also: Dosage Information (in more detail)
What happens if I miss a dose?
Take the missed dose as soon as you remember. Skip the missed dose if it is almost time for your next scheduled dose. Do not take extra medicine to make up the missed dose.
What happens if I overdose?
Seek emergency medical attention or call the Poison Help line at 1-800-222-1222.
What should I avoid while taking Rapaflo?
This medicine may impair your thinking or reactions. Be careful if you drive or do anything that requires you to be alert.
Drinking alcohol with this medicine can cause side effects.
Rapaflo side effects
Get emergency medical help if you have signs of an allergic reaction to Rapaflo: hives; difficult breathing; swelling of your face, lips, tongue, or throat.
Call your doctor at once if you have:
severe dizziness, or if you feel like you might pass out.
Common Rapaflo side effects may include:
abnormal ejaculation; or
stuffy nose, sore throat.
This is not a complete list of side effects and others may occur. Call your doctor for medical advice about side effects. You may report side effects to FDA at 1-800-FDA-1088.
See also: Side effects (in more detail)
What other drugs will affect Rapaflo?
Many drugs can interact with silodosin, and some drugs should not be used together. This includes prescription and over-the-counter medicines, vitamins, and herbal products. Not all possible interactions are listed in this medication guide. Tell your doctor about all medicines you use, and those you start or stop using during your treatment with Rapaflo. Give a list of all your medicines to any healthcare provider who treats you.
Remember, keep this and all other medicines out of the reach of children, never share your medicines with others, and use Rapaflo only for the indication prescribed.
Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.
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More about Rapaflo (silodosin)
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- Drug class: antiadrenergic agents, peripherally acting