Many medications can cause side effects. A side effect is an unwanted response to a medication when it is taken in normal doses. Side effects can be mild or severe, temporary or permanent.

The side effects listed below are not experienced by everyone who takes Rapaflo (Silodosin). If you are concerned about side effects, discuss the risks and benefits of Rapaflo (Silodosin) with your doctor.

The following side effects have been reported by at least 1% of people taking Rapaflo (Silodosin). Many of these side effects can be managed, and some may go away on their own over time.

Contact your doctor if you experience these side effects and they are severe or bothersome. Your pharmacist may be able to advise you on managing side effects.

• Diarrhea
• dizziness
• Dry Cough
• headache
• nasal congestion (stuffy nose)
• reduced or no semen during sexual intercourse
• sore throat

Although most of the side effects listed below don't happen very often, they could lead to serious problems if you do not seek medical attention.

Check with your doctor as soon as possible if any of the following side effects occur:

• cloudy urine
• dizziness, lightheadedness, or fainting when rising from a sitting or lying position
• fast or pounding heartbeat
• pneumonia that is not caused by infection (e.g., cough, trouble breathing, Fever)
• red or purple discolouration of the skin
• signs of liver problems (e.g., nausea, vomiting, diarrhea, loss of appetite, weight loss, yellowing of the skin or whites of the eyes, dark urine, pale stools)

Stop taking the medication and seek immediate medical attention if any of the following occur:

• symptoms of a Anaphylaxis (severe allergic reaction) (e.g., Hives; difficulty breathing; swelling of the mouth, tongue, face, or throat)
• symptoms of a serious skin reaction (e.g., skin rash, peeling or redness)

Some people may experience side effects other than those listed. Check with your doctor if you notice any symptom that worries you while you are taking Rapaflo (Silodosin).

4 mg
Each hard gelatin capsule, with the cap imprinted with "WATSON 151" and body imprinted with "4 mg" in gold contains Rapaflo (Silodosin) 4 mg. Nonmedicinal ingredients: D-mannitol, magnesium stearate, pregelatinized starch, and sodium lauryl sulfate. The size No. 3 hard gelatin capsules contain gelatin and titanium dioxide. The capsules are printed with edible ink containing yellow iron oxide.

8 mg
Each hard gelatin capsule, with the cap imprinted with "WATSON 152" and the body imprinted with "8 mg" in green, contains Rapaflo (Silodosin) 8 mg. Nonmedicinal ingredients: D-mannitol, magnesium stearate, pregelatinized starch, and sodium lauryl sulfate. The size No. 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.

Do not take Rapaflo (Silodosin) if you:

• are allergic to Rapaflo (Silodosin) or any ingredients of Rapaflo (Silodosin)
• are taking any of the following medications
• clarithromycin
• itraconazole
• ketoconazole
• ritonavir
• other alpha blockers (e.g., Doxazosin, Prazosin, Terazosin)
• have severely reduced kidney function
• have severely reduced liver function

Rapaflo (Silodosin) is not intended to be taken by women or by children under 18 years old.

There may be an interaction between Rapaflo (Silodosin) and any of the following:

• alpha agonists (e.g., Clonidine, methyldopa)
• alpha-1 blockers (e.g., doxazosin, phentolamine, prazosin, terazosin)
• Amiodarone
• "azole" antifungals (e.g., itraconazole, ketoconazole, Voriconazole)
• beta blockers (e.g., Atenolol, Carvedilol, Metoprolol, Propranolol)
• Bosentan
• calcium channel blockers (e.g., Diltiazem, Verapamil)
• Carbamazepine
• Cobicistat
• conivaptan
• Cyclosporine
• Deferasirox
• Dipyridamole
• Dronedarone
• Enzalutamide
• grapefruit juice
• Hepatitis C antivirals (e.g., daclatasvir, , ledipasvir, simeprevir, )
• HIV non-nucleoside reverse transcriptase inhibitors (NNRTIs; e.g., delavirdine, efavirenz, etravirine, nevirapine)
• HIV protease inhibitors (e.g., atazanavir, indinavir, ritonavir, saquinavir)
• Ivacaftor
• lumacaftor
• macrolide antibiotics (e.g., clarithromycin, erythromycin,)
• Mitotane
• Modafinil
• nefazodone
• Phenobarbital
• Phenytoin
• phosphodiesterase-5-inhibitors (e.g., Sildenafil, Tadalafil, Vardenafil)
• primidone
• protein kinase inhibitors (e.g., Dasatinib, imatinib, Nilotinib, Sunitinib
• quinidine
• quinine
• rifabutin
• rifampin
• St. John's wort
• Stiripentol
• Tocilizumab

If you are taking any of these medications, speak with your doctor or pharmacist. Depending on your specific circumstances, your doctor may want you to:

• stop taking one of the medications,
• change one of the medications to another,
• change how you are taking one or both of the medications, or
• leave everything as is.

An interaction between two medications does not always mean that you must stop taking one of them. Speak to your doctor about how any drug interactions are being managed or should be managed.

Medications other than those listed above may interact with Rapaflo (Silodosin). Tell your doctor or prescriber about all prescription, over-the-counter (non-prescription), and herbal medications you are taking. Also tell them about any supplements you take. Since caffeine, alcohol, the Nicotine from cigarettes, or street drugs can affect the action of many medications, you should let your prescriber know if you use them.

Before you begin using a medication, be sure to inform your doctor of any medical conditions or Allergies you may have, any medications you are taking, whether you are pregnant or breast-feeding, and any other significant facts about your health. These factors may affect how you should use Rapaflo (Silodosin).

Drowsiness/dizziness: Rapaflo (Silodosin) may cause dizziness. Do not drive, operate machinery, or perform other hazardous tasks until you have determined how Rapaflo (Silodosin) affects you.

Eye surgery: If you are having eye surgery (such as cataract surgery), inform your eye surgeon that you are taking Rapaflo (Silodosin). This type of medication can cause an eye problem during surgery called Intraoperative Floppy Iris Syndrome (IFIS).

Grapefruit and grapefruit juice: Regularly eating grapefruit or drinking grapefruit juice while taking Rapaflo (Silodosin) may cause an increase in the amount of medication in the body, thereby causing an increase in side effects. You should avoid regularly eating or drinking grapefruit products while taking Rapaflo (Silodosin).

Kidney function: Kidney Disease or reduced kidney function may cause Rapaflo (Silodosin) to build up in the body, causing side effects. If you have reduced kidney function, discuss with your doctor how Rapaflo (Silodosin) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Rapaflo (Silodosin), and whether any special monitoring is needed. If you have severely reduced kidney function you should not take Rapaflo (Silodosin).

Liver function: The effect of Rapaflo (Silodosin) on people with reduced liver function has not been studied. If you have liver disease or reduced liver function, discuss with your doctor how Rapaflo (Silodosin) may affect your medical condition, how your medical condition may affect the dosing and effectiveness of Rapaflo (Silodosin), and whether any special monitoring is needed. If you have severely reduced liver function you should not take Rapaflo (Silodosin).

Orthostatic hypotension: People taking Rapaflo (Silodosin) may experience orthostatic hypotension, which is Low Blood Pressure on rising from a lying or sitting position. If you experience dizziness or weakness, sit or lie down until the symptoms have disappeared. Fainting is the most severe symptom of orthostatic hypotension.

If you experience fainting, contact your doctor as soon as possible. Do not drive or perform hazardous tasks until you are certain that Rapaflo (Silodosin) does not impair your ability to perform these tasks safely.

Prostate Cancer: Prostate cancer and BPH cause many of the same symptoms. These two diseases frequently coexist. An evaluation should be done to rule out prostate cancer before Rapaflo (Silodosin) therapy is started. Rapaflo (Silodosin) is not intended to treat symptoms of prostate cancer.

Pregnancy: Rapaflo (Silodosin) is not intended for use by women, including those who are or may be pregnant.

Breast-feeding: Rapaflo (Silodosin) is not intended for use by women, including those who are breast-feeding.

Children: Rapaflo (Silodosin) is not intended for use by children. The safety and effectiveness of Rapaflo (Silodosin) have not been established for use by people in this age group.

Seniors: It is likely that people over the age of 65 will experience more side effects such as dizziness, and should report any unusual effects to their doctor as soon as possible.