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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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On Apr, 24, 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)

Drug effectiveness by gender :

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

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 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 DecreasedAsthenia
DizzinessAstheniaParaesthesiaPancreatitis AcuteHelicobacter InfectionUrinary HesitationPlatelet Count DecreasedOedema Peripheral
ParaesthesiaAbdominal DiscomfortInsomniaAgeusiaUlcerElevated Liver EnzymesElevated Liver EnzymesParaesthesia
Blood Glucose IncreasedRectal HaemorrhageRhabdomyolysisGastric UlcerDiarrhoeaDizzinessFatigue
DiarrhoeaFatigueHiatus HerniaHigh Density Lipoprotein DecreasedMuscle FatiguePneumonia
Abdominal PainDiarrhoeaHigh Density Lipoprotein DecreasedMouth HaemorrhageDyspnoeaCardiac Failure Congestive
Chest PainSensory DisturbanceElectrocardiogram AbnormalEpistaxisErythema
Abdominal DistensionMuscular WeaknessDiverticulumMuscle WeaknessBlood Glucose Increased

Most common drug interactions by gender * :

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

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.

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- support group for people who take Flomax
- support group for people who take Niacin

Recent related drug studies (Check your drugs):

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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