Phentermine and Flomax drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Phentermine (phentermine hydrochloride) and Flomax (tamsulosin hydrochloride). Common drug interactions include nephrogenic anaemia among females and anxiety among males.

The phase IV clinical study analyzes what interactions people have when they take Phentermine and Flomax. It is created by eHealthMe based on reports of 57 people who take the same drugs from the FDA, and is updated regularly.

What is Phentermine?

Phentermine has active ingredients of phentermine hydrochloride. It is often used in weight loss. eHealthMe is studying from 19,870 Phentermine users. Check the latest studies of Phentermine.

What is Flomax?

Flomax has active ingredients of tamsulosin hydrochloride. It is often used in enlarged prostate. eHealthMe is studying from 52,865 Flomax users. Check the latest studies of Flomax.

On Jul, 10, 2026

57 people who take Phentermine and Flomax together, and have interactions are studied.

Phentermine and Flomax drug interactions.

What are the common drug interactions of Phentermine and Flomax, by gender? *:

female:

Nephrogenic anaemia (anaemia due to kidney disease)
Renal failure (kidney dysfunction)
Abdominal pain
Abnormal dreams
Anaphylactic reaction (serious allergic reaction)
Cough
Device dislocation
Diabetes mellitus (diabetes, caused by a deficiency of the pancreatic hormone insulin)
Flank pain (a distressing sensation experienced around the lower back and the upper abdomen)
Haemorrhage (bleeding)

male:

Anxiety
Depression
Weight decreased
Confusional state
Dizziness
Fall
Basal cell carcinoma (a skin cancer, it rarely metastasizes or kills)
Diarrhoea
Drug abuser
Drug dependence

What are the common drug interactions of Phentermine and Flomax, by age (0-1 to 60+)? *:

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

n/a

30-39:

Anaphylactic reaction (serious allergic reaction)
Respiratory arrest (cessation of normal respiration due to failure of the lungs to function effectively)

40-49:

Renal failure (kidney dysfunction)
Anger
Blood pressure decreased
Chest discomfort
Chest pain
Drug hypersensitivity
Emotional disorder
Fatigue (feeling of tiredness)
Feeling hot
Flushing (the warm, red condition of human skin)

50-59:

Anxiety
Depression
Drug abuser
Drug dependence
Drug withdrawal syndrome (interfere with normal social, occupational, or other functioning. are not due to another medical condition, drug use, or discontinuation)
Insomnia (sleeplessness)
Memory impairment
Pain
Sinusitis (inflammation of sinus)
Somnolence (a state of near-sleep, a strong desire for sleep)

60+:

Chronic kidney disease
Renal failure (kidney dysfunction)
Confusional state
Deafness
Dizziness
Faeces discoloured
Fall
Blood potassium decreased
Death
Diabetes mellitus (diabetes, caused by a deficiency of the pancreatic hormone insulin)

What are the existing conditions these people have? *

Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 11 people, 19.30%
Multiple Myeloma (cancer of the plasma cells): 10 people, 17.54%
Pain: 8 people, 14.04%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 7 people, 12.28%
Muscle Spasms (muscle contraction): 5 people, 8.77%
Indigestion: 4 people, 7.02%
High Blood Pressure: 4 people, 7.02%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 3 people, 5.26%
Atrial Fibrillation/flutter (atrial fibrillation and flutter are abnormal heart rhythms in which the atria, or upper chambers of the heart, are out of sync with the ventricles): 3 people, 5.26%
Blood Pressure Abnormal: 3 people, 5.26%

* Approximation only. Some reports may have incomplete information.

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