Faslodex and Bactrim drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Faslodex (fulvestrant) and Bactrim (sulfamethoxazole; trimethoprim). Common drug interactions include fatigue among females and scar among males.

The phase IV clinical study analyzes what interactions people have when they take Faslodex and Bactrim. It is created by eHealthMe based on reports of 97 people who take the same drugs from the FDA, and is updated regularly.

What is Faslodex?

Faslodex has active ingredients of fulvestrant. It is often used in breast cancer metastatic. eHealthMe is studying from 19,255 Faslodex users. Check the latest studies of Faslodex.

What is Bactrim?

Bactrim has active ingredients of sulfamethoxazole; trimethoprim. It is often used in urinary tract infection. eHealthMe is studying from 89,117 Bactrim users. Check the latest studies of Bactrim.

eHealthMe: drug outcomes in the real world

eHealthMe runs one of the largest post-marketing drug safety studies in the world. We study millions of patients and 5,000 more each day. Our data-driven phase IV clinical trials have been referenced on 800+ peer-reviewed medical publications including The Lancet, Mayo Clinic Proceedings, and Nature. Tools to study our phase IV findings are available to the public, anonymous and free >>>.

On Sep, 02, 2026

97 people who take Faslodex and Bactrim together, and have interactions are studied.

What are the common drug interactions of Faslodex and Bactrim, by gender? *:

female:

Fatigue (feeling of tiredness)
Dyspnoea (difficult or laboured respiration)
Anxiety
Injury
Back pain
Diarrhoea
Osteomyelitis (infection of bone)
Osteoarthritis (a joint disease caused by cartilage loss in a joint)
Anhedonia (inability to experience pleasure from activities usually found enjoyable)
Hypertension (high blood pressure)

male:

Scar
Acute sinusitis
Bone loss
Candidiasis (candidiasis or thrush is a fungal infection)
Cellulitis (infection under the skin)
Chronic obstructive pulmonary disease (a progressive disease that makes it hard to breathe)
Chronic sinusitis (long lasting inflammation of the paranasal sinuses)
Constipation
Contusion (a type of hematoma of tissue in which capillaries)
Decreased appetite

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

0-1:

n/a

2-9:

Scar
Acute sinusitis
Anaemia (lack of blood)
Angiopathy (generic term for a disease of the blood vessels)
Anhedonia (inability to experience pleasure from activities usually found enjoyable)
Anxiety
Aortic arteriosclerosis (hardening of the aortic arteries)
Arthropathy
Back pain
Bone disorder

10-19:

Vomiting
Abscess (pus)
Abscess jaw (tooth abscess or root abscess)
Abscess limb (limb infection)
Activities of daily living impaired
Adenocarcinoma (malignant tumour formed from glandular structures in epithelial tissue)
Alopecia (absence of hair from areas of the body)
Anaemia (lack of blood)
Asthenia (weakness)
Ataxia (loss of full control of bodily movements)

20-29:

n/a

30-39:

n/a

40-49:

Dyspnoea (difficult or laboured respiration)
Metastases to bone (cancer spreads to bone)
Arthralgia (joint pain)
Depression
Impaired healing
Mass
Osteomyelitis (infection of bone)
Osteonecrosis of jaw (death of bone of jaw)
Pain
Pneumonia

50-59:

Asthenia (weakness)
Bone disorder
Cardiac failure congestive
Chronic obstructive pulmonary disease (a progressive disease that makes it hard to breathe)
Craniotomy
Disability
Dyspnoea (difficult or laboured respiration)
Fungal infection
Gingival swelling (gums swelling)
Hiatus hernia (hernia resulting from the protrusion of part of the stomach through the diaphragm)

60+:

Pain
Diarrhoea
Constipation
Pain in jaw
Aortic arteriosclerosis (hardening of the aortic arteries)
Fall
Heart rate irregular
Neck pain
Osteoarthritis (a joint disease caused by cartilage loss in a joint)
Back pain

What are the existing conditions these people have? *

Osteoporosis (bones weak and more likely to break): 17 people, 17.53%
Breast Cancer Female: 13 people, 13.40%
Metastases To Bone (cancer spreads to bone): 11 people, 11.34%
Breast Cancer: 9 people, 9.28%
Nausea (feeling of having an urge to vomit): 6 people, 6.19%
Urticaria (rash of round, red welts on the skin that itch intensely): 5 people, 5.15%
Pain: 5 people, 5.15%

* Approximation only. Some reports may have incomplete information.

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