Phenazopyridine hcl and Tecfidera drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Phenazopyridine hcl (phenazopyridine hydrochloride) and Tecfidera (dimethyl fumarate). Common drug interactions include menorrhagia among females and rectal haemorrhage among males.

The phase IV clinical study analyzes what interactions people have when they take Phenazopyridine hcl and Tecfidera. It is created by eHealthMe based on reports of 19 people who take the same drugs from the FDA, and is updated regularly.

What is Phenazopyridine hcl?

Phenazopyridine hcl has active ingredients of phenazopyridine hydrochloride. It is often used in urinary tract infection. eHealthMe is studying from 1,588 Phenazopyridine hcl users. Check the latest studies of Phenazopyridine hcl.

What is Tecfidera?

Tecfidera has active ingredients of dimethyl fumarate. It is often used in multiple sclerosis. eHealthMe is studying from 129,627 Tecfidera users. Check the latest studies of Tecfidera.

On Jul, 29, 2026

19 people who take Phenazopyridine hcl and Tecfidera together, and have interactions are studied.

Phenazopyridine hcl and Tecfidera drug interactions.

What are the common drug interactions of Phenazopyridine Hcl and Tecfidera, by gender? *:

female:

Menorrhagia (an abnormally heavy bleeding and prolonged menstrual period at regular intervals)
Pruritus (severe itching of the skin)
Skin warm
White blood cell count decreased
Memory impairment
Asthenia (weakness)
Influenza
Coma (state of unconsciousness lasting more than six hours)
Duodenal ulcer perforation (untreated ulcer can burn through the wall of the stomach)
Gastric perforation (hole in stomach)

male:

Rectal haemorrhage (bleeding from anus)
Haemorrhoidal haemorrhage (bleeding from the haemorrhoids)
Hot flush (sudden feelings of heat)

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

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

n/a

30-39:

n/a

40-49:

Depression
Fatigue (feeling of tiredness)
Flushing (the warm, red condition of human skin)
Herpes zoster
Influenza like illness
Insomnia (sleeplessness)
Lymphocyte count decreased
Menorrhagia (an abnormally heavy bleeding and prolonged menstrual period at regular intervals)
Pruritus (severe itching of the skin)
Skin warm

50-59:

Alopecia (absence of hair from areas of the body)
Asthenia (weakness)
Diarrhoea
Choking sensation (feeling of obstruction in respiratory system)
Depression
Drug withdrawal syndrome (interfere with normal social, occupational, or other functioning. are not due to another medical condition, drug use, or discontinuation)
Dyspnoea (difficult or laboured respiration)
Fatigue (feeling of tiredness)
Gingival disorder (gum disease)
Haemorrhoidal haemorrhage (bleeding from the haemorrhoids)

60+:

Influenza
Asthenia (weakness)
Dehydration (dryness resulting from the removal of water)
Lower limb fracture
Osteoporosis (bones weak and more likely to break)
Dysuria (painful or difficult urination)
Coma (state of unconsciousness lasting more than six hours)
Duodenal ulcer perforation (untreated ulcer can burn through the wall of the stomach)
Gastric perforation (hole in stomach)
Pneumonia

What are the existing conditions these people have? *

Pain In Extremity: 4 people, 21.05%
Gait Disturbance: 4 people, 21.05%
Weakness: 2 people, 10.53%
Joint Pain: 2 people, 10.53%
Indigestion: 1 person, 5.26%

* Approximation only. Some reports may have incomplete information.

Do you take Phenazopyridine hcl and Tecfidera?

- Personalize this study to your gender, age, symptoms and drugs
- Predict drug outcomes for up to one year with AI
- Get an AI agent to monitor your drugs continuously