Miralax and Fetzima drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Miralax (polyethylene glycol 3350) and Fetzima (levomilnacipran hydrochloride). Common drug interactions include nausea among females and lymphocyte count decreased among males.

The phase IV clinical study analyzes what interactions people have when they take Miralax and Fetzima. It is created by eHealthMe based on reports of 17 people who take the same drugs from the FDA, and is updated regularly.

What is Miralax?

Miralax has active ingredients of polyethylene glycol 3350. It is often used in constipation. eHealthMe is studying from 81,754 Miralax users. Check the latest studies of Miralax.

What is Fetzima?

Fetzima has active ingredients of levomilnacipran hydrochloride. It is often used in depression. eHealthMe is studying from 2,077 Fetzima users. Check the latest studies of Fetzima.

On Jul, 10, 2026

17 people who take Miralax and Fetzima together, and have interactions are studied.

What are the common drug interactions of Miralax and Fetzima, by gender? *:

female:

Nausea (feeling of having an urge to vomit)
Rash
Sleep apnoea syndrome (a sleep-related disorder in which the effort to breathe is diminished or absent)
Therapeutic response unexpected
Cystitis (inflammation of the wall of the bladder)
Abdominal pain upper
Bronchitis (inflammation of the mucous membrane in the bronchial tubes)
Chapped lips (cracking, fissuring, and peeling of the skin f lip)
Insomnia (sleeplessness)
Suicidal ideation

male:

Lymphocyte count decreased
Multiple sclerosis relapse (reoccurrence of a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath)
Muscular weakness (muscle weakness)
White blood cell count increased

What are the common drug interactions of Miralax and Fetzima, 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:

n/a

50-59:

Multiple sclerosis relapse (reoccurrence of a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath)
Muscular weakness (muscle weakness)
Suicidal ideation
White blood cell count increased
Lymphocyte count decreased

60+:

Arthralgia (joint pain)
Dyskinesia (abnormality or impairment of voluntary movement)
Hip arthroplasty
Nasopharyngitis (inflammation of the nasopharynx)
Nausea (feeling of having an urge to vomit)
Rash
Therapeutic response unexpected
Chapped lips (cracking, fissuring, and peeling of the skin f lip)
Urinary tract infection

What are the existing conditions these people have? *

Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 8 people, 47.06%
Multiple Sclerosis (a nervous system disease that affects your brain and spinal cord. it damages the myelin sheath): 3 people, 17.65%
Multiple Myeloma (cancer of the plasma cells): 3 people, 17.65%
Urinary Incontinence (inability to control the flow of urine and involuntary urination): 2 people, 11.76%
Neurodermatitis (a skin disorder characterized by long lasting itching and scratching): 2 people, 11.76%
Drowsiness: 2 people, 11.76%
Cataplexy (loss of muscle tone accompanied by full conscious awareness): 2 people, 11.76%
Swelling: 1 person, 5.88%
Renal Cell Carcinoma (a kidney cancer): 1 person, 5.88%
Pain: 1 person, 5.88%

* Approximation only. Some reports may have incomplete information.

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