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Flomax 0.4mg Capsule

Flomax (tamsulosin) is an FDA-approved medication primarily used to treat symptoms of benign prostatic hyperplasia (BPH) or enlarged prostate. It belongs to a drug class called alpha-adrenergic blockers, which help relax the muscles in the bladder and prostate, improving urine flow. It is administered as an oral capsule. Users must be cautious about potential side effects such as dizziness, low blood pressure, and serious skin reactions. It’s essential to follow the doctor’s dosing instructions closely and discuss all possible drug interactions and surgical considerations with healthcare providers.

Product Overview

Flomax, generically known as tamsulosin, is an effective treatment primarily for benign prostatic hyperplasia (BPH), a condition marked by an enlarged prostate gland that can impede the flow of urine. This medication is part of the alpha-adrenergic blockers group and works by relaxing muscles in the prostate and bladder neck, easing the passage of urine, and alleviating BPH symptoms.

The standard dosage for adults under the age of 65 starts at 0.4 mg daily, potentially increasing to 0.8 mg depending on the patient’s response and tolerability. Elderly patients may require a lower starting dose due to slower drug metabolism. Flomax capsules should be taken approximately 30 minutes after the same meal each day and must be swallowed whole. Patients need to be aware of several important safety considerations when taking Flomax. It can cause notable side effects like dizziness and orthostatic hypotension, particularly after the first dose or when increasing the dose. Serious risks include priapism (a prolonged, painful erection), severe skin reactions, and intraoperative floppy iris syndrome during eye surgery.

It’s crucial for patients to inform all healthcare providers that they are taking Flomax, especially before any surgeries. Drug interactions are significant with Flomax; it can interact with other medications like cimetidine, certain antibiotics, antifungals, and drugs for erectile dysfunction, potentially necessitating dose adjustments or additional monitoring. Flomax requires careful management and routine monitoring to avoid complications and ensure its effectiveness in treating BPH symptoms while minimizing adverse effects.

Uses of Flomax

  • It is used to treat the symptoms of benign prostatic hyperplasia (BPH), which is an enlarged prostate.

How to Use Flomax?


It comes in the form of an oral tablet and has a strength:

  • Flomax 0.4mg Capsule

Recommended Dosage for Different Patients

Adult Dosage (Ages 18 to 64 Years)

  • Typical Dosage: One 0.4 mg capsule daily.
  • Dosage Increase: If your body doesn’t respond to the 0.4 mg dose after two to four weeks, your dosage may be increased to 0.8 mg daily.

Senior Dosage (Ages 65 Years & Older)

  • Considerations: Your body may process this drug more slowly.
  • Doctor’s Approach: Your doctor may start you on a lower dosage to prevent the drug from building up to high levels in your body, which can be dangerous.

[Note: Remember these recommendations may vary depending on person to person. Discuss it with your doctor, and they’ll customize your dosage accordingly.]

How to Take It?

  • This dosage information is specific to Flomax oral capsules. Not all possible dosages and forms are included here. Your doctor will determine the appropriate dosage for you based on:
    • The condition being treated
    • Your age
    • The severity of your condition
    • Your reaction to the first dose
    • Any other medical conditions you have
  • Take this medicine exactly as directed by your doctor.
  • This medicine comes with a patient information insert. Read and follow the instructions in the insert carefully. Ask your doctor if you have any questions.
  • Take the Flomax medication approximately half an hour after the same meal each day.
  • The dose of this medicine will be different for different patients. Follow your doctor’s orders or the directions on the label.
  • Don’t take more Flomax as taking it more often or taking it for a longer time than your doctor ordered.
  • Swallow the capsule whole. Do not crush, chew, or open it.
  • The following information includes only the average doses of this medicine. If your dose is different, do not change it unless your doctor tells you to do so.
  • The amount of medicine you take depends on the strength of the medicine.
  • The number of doses you take each day, the time allowed between doses, and the length of time you take the medicine depend on the medical problem for which you are using the medicine.

[Note: Your doctor will decide the right amount for you based on your condition, following guidelines and studies on the drug. They’ll adjust it as needed over time.]

How Does Flomax Work?

Flomax is part of a group of medications known as alpha-adrenergic blockers. These medications work in a similar way and are often used to treat similar health issues. Flomax works by relaxing the muscles in your bladder and prostate. This relaxation helps improve the flow of your urine.

Important Safety Information

Side Effects

Common side effects of Flomax may include:

  • Back or chest pain
  • Tiredness
  • Loss of energy or muscle strength
  • Headache
  • Sore throat or trouble swallowing
  • Diarrhea
  • Decreased semen
  • Nausea
  • Dizziness
  • Cough
  • Runny nose

Serious side effects of Flomax may include:

  • Allergic reaction
  • Vision problems
  • Chest pain
  • Problems with ejaculation
  • Priapism (long-lasting and sometimes painful erection)*
  • Infection, which may cause flu-like symptoms
  • Orthostatic hypotension (low blood pressure when you stand up)

[Note: Remember, this list may not cover all possible side effects. Always consult with your healthcare giver for medical advice about side effects.]


  • Allergic Reactions: Do not use Flomax if you’re allergic to Flomax. Also, avoid using it if you are taking other similar medications like alfuzosin (Uroxatral), doxazosin (Cardura), prazosin (Minipress), silodosin (Rapaflo), or terazosin (Hytrin).
  • Dizziness and Fainting: Flomax may cause dizziness or fainting, particularly when you first start using it or resume it after a break. If you experience these symptoms, be cautious while driving or doing anything that needs your full attention.
  • Precautions While Standing or Exercising: Try to avoid standing for long periods or getting too hot during exercise or hot weather. Be careful when getting up from a seated or lying position to prevent dizziness.
  • Interruption in Treatment: If you need to stop taking Flomax for any reason, consult your doctor before you begin taking it again. You might need to adjust your dosage.
  • Effects During Surgery: Flomax may affect your pupils during cataract surgery. Inform your eye surgeon that you are using this medication. Follow your surgeon’s advice regarding whether to stop using Flomax before your surgery.
  • Drug Interactions: Many drugs can interact with Flomax. Make sure to inform your doctor about all other medications you are taking.
  • Following Directions: Always follow the instructions on your medicine label and packaging. Inform all of your healthcare providers about your medical conditions, allergies, and all the medicines you are using.

Boxed Warnings

  • Low Blood Pressure Warning: Flomax may cause dizziness or a sudden drop in your blood pressure when you stand up after sitting or lying down. Be cautious and familiarize yourself with how Flomax affects you before engaging in activities that could result in injury, especially after taking your first dose or an increased dose.
  • Priapism Warning: In rare cases, Flomax can lead to priapism, which is a prolonged, painful erection unrelated to sexual activity. If this occurs, contact your doctor immediately. Untreated priapism can result in permanent impotence (inability to achieve an erection).
  • Skin Reactions Warning: Although uncommon, Flomax can cause severe skin reactions, such as Stevens-Johnson syndrome. This serious condition may include symptoms like raised welts, facial swelling, fever, and difficulty breathing. If you experience these symptoms, seek medical attention immediately or call 911.
  • Intraoperative Floppy Iris Syndrome (IFIS) Warning: IFIS is a potential complication during cataract or glaucoma surgery. While rare, it has been associated with patients taking Flomax. Inform your doctor or surgeon if you are taking Flomax before undergoing surgery for cataracts or glaucoma.


  • Ensure that your doctor regularly monitors your progress and checks for any unwanted effects while taking this medication.
  • You may experience dizziness, lightheadedness, or fainting, especially when standing up from a lying or sitting position. Get up slowly to help minimize this issue. If you feel dizzy, lie down to prevent fainting, and then sit for a few moments before standing.
  • Be cautious when driving, operating machinery, or performing tasks that require alertness, as Flomax may cause dizziness or fainting in some individuals.
  • Seek immediate medical attention if you experience a severe allergic reaction, such as swelling of the face, tongue, or throat, difficulty breathing, or blistering of the skin.
  • If you experience a prolonged erection while using this medication, seek prompt medical attention, as this rare side effect requires immediate treatment to prevent permanent erectile dysfunction (impotence).
  • Inform your eye doctor (ophthalmologist) if you are taking or have taken this medication within the past 9 months, especially if you plan to undergo cataract or glaucoma surgery. This medication has been associated with a serious eye problem called Intraoperative Floppy Iris Syndrome (IFIS) in some patients undergoing these procedures.
  • Do not take any other medications, including prescription, over-the-counter (OTC), herbal, or vitamin supplements, without discussing them with your doctor first.
  • Be vigilant for any signs of dizziness, fainting, or other adverse effects, and report them to your doctor immediately.
  • Strictly follow your doctor’s instructions for taking this medication and attend all scheduled follow-up appointments to ensure proper monitoring and management of your condition.

Missed Dose

  • If you miss a dose of this medicine, take it as soon as possible. 
  • However, if it is almost time for your next dose, skip the missed dose and return to your regular dosing schedule. 
  • Don’t take 2 doses at once to make up for a missed dose.

[Note: If you have missed a dose of your medication and are unsure about when to take the next one, immediately consult your doctor or pharmacist.]


Taking an excessive amount of this medication can lead to dangerously low blood pressure. Immediate actions you can take:

  • If you suspect an overdose, contact your doctor or, get in touch with the American Association of Poison Control Centers, or use their online tool for guidance.
  • For severe symptoms, call 911 or visit the nearest emergency room immediately.

[Note: If you consumed more than the recommended dose, get medical help right away, or call the Poison Help line at 1-800-222-1222.]


  • Store the medicine in a closed container at room temperature, away from heat, moisture, and direct light. Keep it from freezing.
  • Keep out of the reach of children.
  • Do not keep outdated medicine or medicine no longer needed.
  • Ask your healthcare professional how to dispose of any medicine you do not use.

[Note: Discuss with your healthcare professional about the proper disposal of any unused medicine and any questions you may have regarding its storage.]

Flomax Interactions

Flomax May Interact With Other Medications

Flomax may interact with other medications. The oral capsule form of Flomax can interact with other medicines, vitamins, or herbs you may be taking. An interaction occurs when a substance changes the way a drug works. This can be harmful or prevent the drug from working effectively. To help avoid interactions, your doctor should manage all of your medications carefully. 

Be sure to tell your primary health care giver about all the medications, vitamins, or herbs you’re currently taking. To find out how Flomax might interact with something else you’re taking, talk to your doctor or pharmacist. This list given below is not exhaustive, so always consult your healthcare provider for comprehensive information. Examples of drugs that can cause interactions with Flomax are listed below. 

  • Acid-blocking Drug: Taking cimetidine with Flomax can increase the levels of Flomax in your body. This raises your risk of side effects from Flomax. Therefore, these drugs should be used together cautiously, and your doctor should monitor you closely if you need to take both medications.
  • Antibiotic: Taking erythromycin with Flomax could increase the levels of Flomax in your body. This can raise your risk of side effects from Flomax. Therefore, these drugs should be used together cautiously, and your doctor should monitor your condition closely if you need to take both medications.
  • Antidepressant (SSRI): Taking paroxetine with Flomax can increase the levels of Flomax in your body. This raises your risk of side effects from Flomax. Therefore, these drugs should be used together cautiously, and your doctor should monitor you closely if you need to take both medications.
  • Antifungal drugs: Taking certain antifungal medications with Flomax can increase the levels of Flomax in your body, raising your risk of side effects. Always consult your doctor or pharmacist for advice on managing potential drug interactions. Examples of these drugs include:
    • Terbinafine: These drugs should be used together cautiously. Your doctor should monitor you closely if you need to take both medications.
    • Ketoconazole: Do not use this drug with Flomax, as it can significantly increase Flomax levels in your body, leading to a higher risk of serious side effects.
  • Erectile Dysfunction (ED) Drugs: Taking erectile dysfunction (ED) drugs with Flomax can cause your blood pressure to drop to very low levels. This can be dangerous and may lead to symptoms like dizziness or fainting. Due to the risk of significantly low blood pressure, these drugs should be used together cautiously. Always consult your doctor before combining Flomax with any ED medication, and ensure your condition is closely monitored. Examples of these ED drugs include:
    • Sildenafil
    • Tadalafil
    • Vardenafil
  • Other Benign Prostatic Hyperplasia Drug: Taking alfuzosin with Flomax, a side effect of Flomax, could worsen low blood pressure. Low blood pressure symptoms can include dizziness, fainting, and falls. Therefore, these drugs should be used together cautiously, and your doctor should monitor your condition closely if you need to take both medications.
  • Alpha blockers: Taking alpha blockers with Flomax can cause very low blood pressure. This can be dangerous and lead to symptoms like dizziness, fainting, and falls. Examples of alpha blockers include:
    • Doxazosin
    • Prazosin

Always consult your doctor before combining Flomax with any alpha blocker, and ensure your condition is closely monitored to prevent serious side effects.

[Note: This isn’t a complete list, and there could be other drugs that interact with Flomax. Make sure to tell your primary care giver about any prescription, over-the-counter medicines, and herbal products you’re taking.]

Flomax Alternatives

[Note: Your doctor will choose what’s best for you. Don’t use any of these alternative medications without consulting your healthcare provider. Taking them by yourself may cause serious side effects.] 

Frequently Asked Questions

How long does it take for Flomax to work?

Flomax typically starts to show effects within the first 48 hours after you begin taking it. However, it may take between two to six weeks for you to experience full relief from urinary symptoms. If you do not notice improvement with the initial 0.4 mg dose, your healthcare provider might suggest increasing the dose to 0.8 mg once daily rather than taking 0.4 mg twice a day. Always follow your healthcare provider’s instructions regarding dosage adjustments.

Does Flomax make you pee more or less?

Flomax, which contains Flomax, generally helps you pee more easily rather than increasing the frequency of urination. Flomax is classified as an alpha blocker and functions by relaxing the smooth muscles in your prostate and bladder. This relaxation aids in easing the flow of urine, making it simpler to urinate and improving urinary symptoms. This can be particularly helpful for individuals experiencing difficulty due to an enlarged prostate.

Does Flomax give you a hard-on?

Flomax is primarily used to treat urinary symptoms associated with an enlarged prostate and is not designed to induce erections. While it works as a selective alpha-blocker that relaxes smooth muscles in the prostate and bladder, theoretically, it might also affect blood flow in other areas. However, any effect on erectile function is usually incidental and not the intended purpose of the medication. In some cases, Flomax can actually cause issues with ejaculation rather than promoting erections.

Does Flomax harm the kidneys?

Flomax is generally safe for the kidneys and is sometimes prescribed by healthcare providers to help pass kidney stones more quickly. It works by relaxing the muscles in the urinary tract, which can facilitate the passage of stones. While Flomax is usually safe, like all medications, it can have side effects. It’s important to monitor your condition and inform your healthcare provider if you feel that the kidney stone isn’t passing or if your symptoms seem to be getting worse. Always follow the guidance of your healthcare provider when taking Flomax, especially in relation to kidney stones.

What happens if I suddenly stop taking Flomax?

Flomax, the active ingredient in Flomax, is typically safe for long-term use and is most effective when taken consistently over an extended period. If you suddenly stop taking Flomax, you might experience a return of your symptoms, potentially worsening your condition. This is because the medication’s effects on relaxing the muscles in your prostate and bladder, which help improve urine flow and reduce symptoms, will cease. Always consult your healthcare provider before making any changes to your medication regimen, including stopping Flomax, to ensure you manage your symptoms effectively and avoid complications.

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