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Review: taking Flomax and Niacin together

Summary: drug interactions are reported among people who take Flomax and Niacin together.

This review analyzes the effectiveness and drug interactions between Flomax and Niacin. It is created by eHealthMe based on reports of 735 people who take the same drugs from FDA and social media, and is updated regularly.





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What are the drugs

Flomax has active ingredients of tamsulosin hydrochloride. It is often used in enlarged prostate. (latest outcomes from 21,472 Flomax users)

Niacin has active ingredients of niacin. It is often used in high blood cholesterol. (latest outcomes from 6,316 Niacin users)

On Feb, 5, 2015: 735 people who take Flomax, Niacin are studied

Flomax, Niacin outcomes

Drug combinations in study:
- Flomax (tamsulosin hydrochloride)
- Niacin (niacin)

Drug effectiveness over time :

< 1 month1 - 6 months6 - 12 months1 - 2 years2 - 5 years5 - 10 years10+ yearsnot specified
Flomax is effective20.00%
(1 of 5 people)
(0 of 4 people)
(0 of 4 people)
(3 of 5 people)
(2 of 8 people)
(1 of 2 people)
(0 of 1 people)
Niacin is effective0.00%
(0 of 1 people)
(1 of 1 people)
(1 of 4 people)
(4 of 8 people)
(6 of 9 people)
(1 of 2 people)

Most common drug interactions over time * :

< 1 month1 - 6 months6 - 12 months1 - 2 years2 - 5 years5 - 10 years10+ yearsnot specified
FlushingFlushingFlushingDizzinessPeptic Ulcer HaemorrhageRestless Leg SyndromeMean Cell Haemoglobin DecreasedFlushing
PruritusArthralgiaPruritusErectile DysfunctionGastric Ulcer HelicobacterLeg CrampsMean Cell Volume AbnormalPruritus
Feeling HotHyperhidrosisAnaemiaDiarrhoeaAstheniaNight SweatsRed Blood Cell Count DecreasedDizziness
DizzinessAstheniaParaesthesiaPancreatitis AcuteHelicobacter InfectionUrinary HesitationPlatelet Count DecreasedAsthenia
ParaesthesiaAbdominal DiscomfortInsomniaAgeusiaUlcerElevated Liver EnzymesElevated Liver EnzymesOedema Peripheral
Blood Glucose IncreasedRectal HaemorrhageRhabdomyolysisGastric UlcerDiarrhoeaDizzinessParaesthesia
DiarrhoeaFatigueHiatus HerniaHigh Density Lipoprotein DecreasedMuscle FatigueFatigue
Abdominal PainDiarrhoeaHigh Density Lipoprotein DecreasedMouth HaemorrhageDyspnoeaPneumonia
Chest PainSensory DisturbanceElectrocardiogram AbnormalEpistaxisCardiac Failure Congestive
Abdominal DistensionMuscular WeaknessDiverticulumMuscle WeaknessErythema

Drug effectiveness by gender :

Flomax is effectiven/a24.14%
(7 of 29 people)
Niacin is effectiven/a52.00%
(13 of 25 people)

Most common drug interactions by gender * :

Escherichia InfectionFlushing
Cardiac Failure CongestivePruritus
Neuropathy PeripheralOedema Peripheral
Therapeutic Agent ToxicityParaesthesia
Staphylococcal InfectionPneumonia
Muscle SpasmsFatigue

Drug effectiveness by age :

Flomax is effectiven/an/an/an/an/a0.00%
(0 of 1 people)
(2 of 8 people)
(5 of 21 people)
Niacin is effectiven/an/an/an/an/a0.00%
(0 of 1 people)
(2 of 7 people)
(11 of 18 people)

Most common drug interactions by age * :

n/an/an/an/an/aChest PainFlushingFlushing
FlushingPruritusCardiac Failure Congestive
Bipolar DisorderFatigueAsthenia
CellulitisFeeling HotOedema Peripheral
Cardiac DisorderBlood Pressure DecreasedPneumonia
ConstipationAtrial FibrillationDyspnoea
HeadacheCarcinoma In Situ Of EyeFatigue

* Some reports may have incomplete information.

How to use the study: print a copy of the study and bring it to your health teams to ensure drug risks and benefits are fully discussed and understood.

Get connected: join our support group of Flomax and Niacin on

Do you take Flomax and Niacin?

You are not alone! Join a related mobile support group:
- support group for people who take Flomax and Niacin
- support group for people who take Flomax
- support group for people who take Niacin

Can you answer these questions (Ask a question):

More questions for: Flomax, Niacin

You may be interested at these reviews (Write a review):

  • Psoriasis and flomax
    I have been on Flomax for 4 years now and have been having a sore ulcerated mouth for about 3 years off and on. About six months ago I developed psoriasis on my scalp and have been using different medications described by my doctor.

    Then three months ago I got a patch on my leg. I started looking at medicines side effect. I found out on the internet last week that Flomax might be the culpert.

    It has been one week since I stopped taking it and today my leg psoriasis is starting to fade away. Has not itched all day today. TYJ!

    The patch on my scalp is doing the same. The scalp thickness has improved tremendously. I just hope I don't start having trouble with my BPH again, so for so good.
  • Weight loss associated with flomax within the last 10 years.
    I have been taking flomax for approx. 10 yrs.I was then & still is very active
    I exercise for one HR.every morning (5 days a week)walk for 2 miles every day,
    ride my bike occasionlly,I am now 82 yrs.old.My problem is "weight loss".
    I'm 5'9" tall,I weighed 175 lbs.when I first started to take Flomax,within 3
    months,I was down to 160 lbs.(I had 0 fat on my body)I am now down to 140 lbs.
    my family & friends can't believe the weight loss.I feel good,strong,but I don't look good,I'm too skinny.Flomax as been very effective for me.
    Is flomax the reason for my weight loss?
    John Robitaille.
  • Chills associated with ibuprophen (1 response)
    I generally respond well to medication. I am a senior who has chronic pain from a c1-c2 fusion. Codeine works well, and I don't use a lot. Still, I sought alternatives to opiates for nerve pain. I lice in a colder climate. It took me quite a while to associate susceptibility to becoming chilled with Ibuprophen. I thought it was age and/or the weather. Perhaps these are factors; but it happens every time I use Ibuprophen. I share this hoping it can help others.
  • Niacin induced thrombocytopena
    On peritoneal dialysis, 40mg Lipitor and 3000mg Niaspan. Platelets decreased to 12 and residual renal function fell off a cliff. Examination of patient's records for 10+ years showed long term platelet decline. Niaspan discontinued, platelets recovered to 120-200 (varies depending on sample) and some residual renal function returned.

More reviews for: Flomax, Niacin

Comments from related studies:

  • From this study (1 year ago):

  • Tired all the time


  • From this study (2 years ago):

  • later in the afternoons I feel better


  • From this study (2 years ago):

  • i have not changed any doctor ordered medications , however, due to allergies, I recently bought over the counter Claritin and then zyrtec. Since then, I am getting the tingling in my right hand? Can you advise?


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Complete drug side effects:

On eHealthMe, Flomax (tamsulosin hydrochloride) is often used to treat enlarged prostate. Niacin (niacin) is often used to treat high blood cholesterol. Find out below the conditions the drugs are used for, how effective they are, and any alternative drugs that you can use to treat those same conditions.

What is the drug used for and how effective is it:

Other drugs that are used to treat the same conditions:

NOTE: The study is based on active ingredients. Other drugs that have the same active ingredients are also considered.

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only, and has not been supported by scientific studies or clinical trials unless otherwise stated. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

You may report adverse side effects to the FDA at or 1-800-FDA-1088 (1-800-332-1088).

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.


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