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Rapaflo Capsules

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Rapaflo Capsules

RAPAFLO®
(silodosin) Capsules

Rapaflo Capsules

DRUG DESCRIPTION

RAPAFLO is the brand name for silodosin, a selective antagonist of alpha-1 adrenoreceptors. The chemical name of silodosin is 1-(3-Hydroxypropyl)-5-[(2R)-2-({2-[2-(2,2,2trifluoroethoxy)phenoxy]ethyl}amino)propyl]-2,3-dihydro-1H-indole-7-carboxamide and the molecular formula is C25H32F3N3O4 with a molecular weight of 495.53. The structural formula of silodosin is:

RAPAFLO® (silodosin) Structural Formula Illustration

Silodosin is a white to pale yellowish white powder that melts at approximately 105 to 109°C. It is very soluble in acetic acid, freely soluble in alcohol, and very slightly soluble in water.

Each RAPAFLO 8 mg capsule for oral administration contains 8 mg silodosin, and the following inactive ingredients: D-mannitol, magnesium stearate, pregelatinized starch, and sodium lauryl sulfate. The size #1 hard gelatin capsules contain gelatin and titanium dioxide. The capsules are printed with edible ink containing FD&C Blue No. 1 Aluminum Lake and yellow iron oxide.

Each RAPAFLO 4 mg capsule for oral administration contains 4 mg silodosin, and the following inactive ingredients: D-mannitol, magnesium stearate, pregelatinized starch, and sodium lauryl sulfate. The size #3 hard gelatin capsules contain gelatin and titanium dioxide. The capsules are printed with edible ink containing yellow iron oxide.

What are the possible side effects of silodosin (Rapaflo)?

Get emergency medical help if you have any of these signs of an allergic reaction: hives; difficulty breathing; swelling of your face, lips, tongue, or throat.

Stop using silodosin and call your doctor at once if you have a serious side effect such as:

  • feeling like you might pass out; or
  • penis erection that is painful or lasts 4 hours or longer.

Less serious side effects may include:

  • mild dizziness;
  • headache;
  • diarrhea;
  • abnormal ejaculation; or
  • runny or stuffy nose, sore throat.

This is not a...

Read All Potential Side Effects and See Pictures of Rapaflo Capsules »

Last reviewed on RxList: 7/30/2013
This monograph has been modified to include the generic and brand name in many instances.

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Report Problems to the Food and Drug Administration

 

You are encouraged to report negative side effects of prescription drugs to the FDA. Visit the FDA MedWatch website or call 1-800-FDA-1088.


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