Flomax (Tamsulosin) prescription available online

If you are suffering from kidney stones, benign prostatic hyperplasia, and bladder outlet obstruction, Flomax can help. Get a new prescription or refill of Flomax from a board-certified doctor today.*

Book an appointment

Treats enlarged prostate, kidney stones, and bladder blockages

Complete the full course for optimal treatment

Relaxes muscles, improves blood flow

*Prescriptions are provided at the doctor’s discretion. Learn more about our controlled substances policy and how you can save up to 80% with our prescription discount card.

About Flomax (Tamsulosin)

Flomax is considered an alpha 1 blocker, which functions by relaxing the prostate gland muscles and bladder neck muscles. Like any alpha-blockers, this medication can only be used to block the effects of norepinephrine. This hormone makes the muscles in the walls of the veins, and smaller arteries tighten.

The drug enhances blood flow. Due to its muscle-relaxing properties, Flomax can also enhance urine flow in men with prostate issues. It is ineffective against hypertension (high blood pressure) because it can't produced the same effect as blood pressure medicines.

Some conditions that Flomax (Tamsulosin) is known to treat include an enlarged prostate, kidney stones, and blockages at the base of the bladder. Flomax is available only by prescription. It is available in a generic formulation as well as under different brand names, including Flomaxtra XL.

Flomax may be prescribed as capsules and are available in a single dosage form of 0.4mg. It's always important to follow the specific instructions on your prescription, as they can vary based on the formulation and dosage that you as prescribed.

If you are prescribed Flomax, be sure to complete the full course of alpha 1 blockers unless your doctor specifically tells you to stop.

Flomax uses

Flomax capsules are FDA approved for treating symptoms and signs of benign prostatic hyperplasia BPH. But Tamsulosin may also be used off-label to treat other conditions. Your online medical professional may prescribe it for any of the following common reasons. It’s also possible that your health care provider may prescribe it for other reasons not listed here. If you have questions about why a medication is prescribed, ask your online doctor or pharmacist.

  • Primary Flomax Uses

    Flomax is FDA approved for treating signs of urinary hesitancy from benign prostatic hyperplasia BPH. It can improve urine flow, manage the weak stream, and curb the need for urgent or often urination. Taking Flomax capsules can help patients who feel they can’t empty their bladder completely. But, Flomax capsules cannot shrink an enlarged prostate. Therefore, even if you keep taking the product, the prostate can continue to get bigger. Flomax capsules keep lessening the prostate symptoms until surgery might be necessary.

  • Off-Label Flomax Uses

    This drug can be useful for different medical conditions. Flomax capsules are used off-label to help remove kidney stones from the system. Since the formula can increase the volume of urinary fluid and relax the muscles, it can make it easier to urinate. Clinical trials show that Tamsulosin amplifies the kidney stone expulsion rate. It also reduces the time to expulsion and the need for pain management, surgery, and hospitalization. Based on the results, Flomax capsules are effective and safe drugs for stimulating the spontaneous passage of kidney stones. Particularly kidney stones 10 mm or smaller. Off-label Flomax capsules may also be prescribed to women and men with an overactive bladder. Flomax capsules can help with voiding in users with or without multiple sclerosis. A healthcare professional could suggest Flomax off-label for female voiding dysfunction and male prostatitis.

Flomax side effects

The side effects associated with taking Flomax are typically mild to severe. Most Flomax side effects are related to abnormal ejaculation, lightheadedness, dizziness, and stuffy or runny nose. If any of these side effects of Flomax get worse, tell your doctor.

  • Flomax has some common side effects. They may include:

    Other side effects from taking Flomax capsules, which are less common but might be more severe, could include:

    Mild side effects of 0.4 mg Flomax, like runny nose, don’t need any treatment. You should call your doctor if you notice any serious side effects or other concerning symptoms. For example, developing adverse effects that could lead to erectile dysfunction. Such as priapism. Without treatment, this extended painful erection can permanently damage the penis.

    Some users also experience chest pain. If you are taking Flomax capsules and you already have notable heart problems, the odds of chest pain with this drug might increase. The use of Flomax capsules in young children is not approved. But, a doctor might decide to recommend it if the benefits outweigh the risks.

    An allergic reaction to Flomax capsules can include tongue or throat swelling. Allergic reactions also lead to itching, rash, difficulty breathing, and hives. In patients with sulfa allergy, allergic reactions to 0.4 mg Flomax have been recorded. But, these types of allergic reactions are relatively rare. If an allergic reaction does develop, it is important to tell your doctor. Just like any other drug, it is vital to avoid an allergic reaction and use the medicine that benefits the body.

How to take Flomax

Your pharmacist will provide you with instructions on how to take your Flomax prescription.

Be sure to read your prescription label and follow the instructions. Call your doctor or pharmacy if you have any questions.

Flomax can come in different forms and doses, so follow the specific instructions on your prescription. It is typically prescribed 0.4 mg once a day. The 0.4 mg daily dose is usually used for BPH treatment.  Some particular instructions may include:

  • Take a 0.4 mg dose daily, 30 min after the same meal.

  • Avoid chewing, crushing, or opening the capsules. It’s important to swallow the 0.4 mg dose whole.

  • The dosage can vary based on different medical conditions and treatment responses.

The 0.4 mg dose could be increased to 0.8 mg daily in some patients. No dose adjustment of Flomax may be needed in patients with hepatic impairment or renal impairment.

For proper storage, keep the 0.4 mg Flomax capsules at room temperature, preferably in a sealed container. You don’t want moisture, heat, or direct sunlight to damage the contents. Avoid storing the 0.4 mg Flomax capsules in the freezer. Just like other medicines, check the expiration date before using Flomax capsules. Otherwise, you might increase the risk of side effects.

What to avoid while taking Flomax

Flomax has 275 currently recorded drug interactions. Alongside 2 food or alcohol interactions, and 4 disease interactions. The majority of these drug interactions are moderate, some are major, and only a few are minor. Don’t change what you are taking without checking with your doctor or pharmacist. That includes other medications or supplements, as well as over-the-counter drugs. 

It is important to avoid using alpha-adrenergic blocking agents together when taking Flomax capsules. Other drugs (alpha-blockers) like terazosin and prazosin can interact with this medication.

If you are using ED drugs or other drugs to treat pulmonary hypertension (high blood pressure in the pulmonary arteries), you might experience a sudden drop in blood pressure. This low blood pressure can cause fainting or dizziness. Ask for medical help to adjust the medication and decrease the risk of low blood pressure.  

The probable disease interactions with Flomax capsules include severe liver disease. And a drastic drop in blood pressure after lying down or when standing after sitting for too long. As well as glaucoma and end-stage renal disease.

Ask your doctor or pharmacist if it is acceptable to consume alcohol while taking Flomax. It is usually OK to consume a bit of alcohol with Flomax capsules. But, in the first couple of days after starting therapy, it is best to avoid it.

Some research shows that regular alcohol consumption may amplify the blood pressure plummeting effect. And this could make you feel lightheaded and dizzy. Alcohol may also reduce the medication’s ability to do its job, making it harder to supply the body with the necessary benefits. Consume too much, and you are more likely to develop kidney or liver problems.

Medication alternatives to Flomax

Suppose your healthcare provider prefers to put you on another treatment altogether. In that case, they may suggest another alpha-blocker capable of managing BPH or sildenafil, a PDE5 inhibitor in another drug class. Here are some common doctor-recommended alternatives based on your health issue:

  • Benign Prostatic Hyperplasia

    Uroxatral (alfuzosin) is an alpha-blocker for BPH treatment. The drug is meant to enhance urination in men. The suggested alfuzosin HCl dose is 10 mg daily. It should be consumed with wood and with the same meal every day. Patients should swallow the tablets whole and not crush or chew them. The possible side effects include constipation, nausea, stomach pain, heartburn, runny nose, etc.

  • Benign Prostatic Hyperplasia

    Rapaflo (silodosin) is a prescription alpha-1 blocker. The capsules can treat BPH symptoms and be used alone or alongside other drugs. The product makes urinating easier for patients, particularly those struggling with an enlarged prostate. Patients can get 4 mg or 8 mg doses of hard gelatin capsules. The potential side effects could include abnormal ejaculation, dizziness, headache, sinus pain, diarrhea, etc.

  • Hypertension and BPH Treatment

    Doxazosin (Cardura) is an alpha-blocker that can compensate for what Flomax is lacking. It can treat too high blood pressure and relieve BPH symptoms. Therefore, it can be a viable option for enhancing urine flow due to prostate enlargement and treating hypertension. The drug comes in 1 mg, 2 mg, 4 mg, and 8 mg tablet doses. The potential side effects include unexpected weight gain, tiredness, lightheadedness, dark urine, etc.

  • Erectile Dysfunction and Pulmonary Hypertension

    Sildenafil (Viagra) is a PDE5 inhibitor for treating erection troubles and could help with pulmonary hypertension. It is one of the most widely used ED drugs for improving circulation to the penis. It can also curb the lower urinary tract symptoms caused by BPH. It comes in chewable tablets, standard tablets, and liquid for those who have trouble swallowing classic tablets. Viagra can trigger side effects such as an upset stomach, flushing, headaches, etc.

Flomax prescription FAQs

  • How much does Flomax cost?

    For 90 capsules with a 0.4 mg dose, you can expect an average cost of around $850.00. With Flomax coupons and discounts, you can lower the price to about $19.78 for 30 capsules. The prices, however, can vary from one pharmacy to another. So, it is important to compare the prices and get coupons to reduce the cost.

  • How can I refill my Flomax prescription?

    This is a prescription-only drug, meaning you require a valid Flomax prescription from a healthcare professional to purchase the product. You can also mail a copy of your prescription or original pharmacy receipt to get a refill.

  • What time of day is it best to take Flomax?

    It is best to get a 0.4 mg dose first thing in the morning after eating breakfast. This gives the product enough time to provide the necessary benefits and help with the enlarged prostate symptoms.

  • When should you not take Flomax?

    You shouldn’t be using the drug or similar other drugs if you experience an allergic reaction. Don’t use it together with similar medicine like Rapaflo, Cardura, or Uroxatral. Don’t take it on an empty stomach, as it can lead to exceedingly high Flomax levels in the system.

  • What are the dangers of taking Flomax?

    Ejaculation problems, runny nose, drowsiness, dizziness, and lightheadedness are some of the classic dangers of taking Flomax. In very rare cases, Flomax capsules can cause severe side effects, like priapism. If you don’t treat the problem, it could lead to permanent complications with keeping or getting an erection.  

  • How long does it take for Flomax to kick in?

    It could take up to 4 weeks before you notice a drastic change in symptoms. Call your doctor if the symptoms are not improving within that time period or are getting worse.

  • Who should not take Flomax?

    Tell your doctor if you have cataract surgery, priapism, orthostatic hypotension (a type of low blood pressure), reduced p450 CYP3A4 cytochrome activity, and poor CYP2D6 metabolizer. These medical conditions could be contraindicated with Flomax capsules.

  • What happens if I miss a dose of Flomax?

    Take a capsule as early as possible in case of a missed Flomax dose. But, if the next dose is near, skip the missed dose and go for the regular one. Avoid taking double Flomax doses, or you might increase the odds of side effects.

  • What happens if I take too much Flomax?

    Flomax overdose could make the blood pressure plummet. It can also lead to quickened heartbeat, headaches, chest pain, and fainting. Tell your doctor if you have difficulty breathing, an allergic reaction, or if you took more than the recommended 0.4 mg dose.

  • Can I buy Flomax over the counter?

    The active ingredient in Flomax, tamsulosin, was previously a prescription-only but is now available as Flomax Relief MR over-the-counter to treat enlarged prostate (BPH). This allows for easier access for some men experiencing BPH symptoms.

    Remember, Flomax may not be suitable for everyone depending on underlying conditions and other medications you may be taking. It's best to consult a doctor online or locally to ensure proper diagnosis and minimize potential risks. A doctor will also help make sure you have the right diagnosis. BPH can mimic other conditions, and a doctor's assessment ensures you receive the most effective care. Your can assess your individual health risks associated with taking Flomax and prescribe the appropriate dosage, adjusting your dose over time if necessary.

3 simple steps to request your Flomax prescription today

Step 1

Book a Flomax prescription request appointment.

You can book a same-day appointment from anywhere.

Step 2

Talk to your medical provider regarding your Flomax prescription.

Talk with a doctor on your smartphone or computer.

Step 3

Pick up your Flomax prescription.

We can send prescriptions to any local pharmacy.

Flomax prescription pricing details

How pricing works

To get a new or refill on your Flomax prescription, join our monthly membership and get discounted visits.

Paying with insurance



First month free



30 days of free membership

  • Same-day appointments 7 days a week

  • Unlimited messages with your Care Team

  • Prescription discount card to save up to 80%

  • Exclusive discounts on lab tests

  • Free memberships for your family

  • Cancel anytime

Visit price with insurance

Often the same as an office visit. Most patients with in-network insurance pay $30 or less!

  • We accept these insurance plans and many more:

    • Humana
    • Aetna
    • Cigna

Paying without insurance



First month free



30 days of free membership

  • Same-day appointments 7 days a week

  • Unlimited messages with your Care Team

  • Prescription discount card to save up to 80%

  • Exclusive discounts on lab tests

  • Free memberships for your family

  • Cancel anytime

Visit price without insurance

Initial visits are $129.

Book an appointment

If we're unable to treat you, we'll provide a full refund.


PlushCare is dedicated to providing you with accurate and trustworthy health information.

PlushCare content is reviewed by MDs, PhDs, NPs, nutritionists, and other healthcare professionals. Learn more about our editorial standards and meet the medical team. The PlushCare site or any linked materials are not intended and should not be construed as medical advice, nor is the information a substitute for professional medical expertise or treatment.