Focalin and Tamiflu drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Focalin (dexmethylphenidate hydrochloride) and Tamiflu (oseltamivir phosphate). Common drug interactions include glucose tolerance impaired among females and asthenia among males.

The phase IV clinical study analyzes what interactions people have when they take Focalin and Tamiflu. It is created by eHealthMe based on reports of 16 people who take the same drugs from the FDA, and is updated regularly.

What is Focalin?

Focalin has active ingredients of dexmethylphenidate hydrochloride. It is often used in attention deficit hyperactivity disorder. eHealthMe is studying from 4,781 Focalin users. Check the latest studies of Focalin.

What is Tamiflu?

Tamiflu has active ingredients of oseltamivir phosphate. It is often used in the flu. eHealthMe is studying from 22,209 Tamiflu users. Check the latest studies of Tamiflu.

On Jul, 08, 2026

16 people who take Focalin and Tamiflu together, and have interactions are studied.

What are the common drug interactions of Focalin and Tamiflu, by gender? *:

female:

Glucose tolerance impaired (blood glucose is raised beyond normal levels, but not high enough to warrant a diabetes diagnosis)
Hypertension (high blood pressure)
Urticaria (rash of round, red welts on the skin that itch intensely)

male:

Asthenia (weakness)
Anxiety
Myalgia (muscle pain)
Myocardial infarction (destruction of heart tissue resulting from obstruction of the blood supply to the heart muscle)
Overweight
Respiratory disorder (respiratory disease)
Cataplexy (loss of muscle tone accompanied by full conscious awareness)
Weight increased
Blood pressure increased
Bradycardia (abnormally slow heart action)

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

0-1:

n/a

2-9:

Eye infection
Sinusitis (inflammation of sinus)
Streptococcal infection
Throat tightness
Upper respiratory tract infection
Vomiting
Cough
Disinhibition (loss of inhibition)

10-19:

Anxiety
Cataplexy (loss of muscle tone accompanied by full conscious awareness)
Bradycardia (abnormally slow heart action)
Hallucination, visual (seeing things that aren't there)
Hypoperfusion (decreased blood flow through an organ)
Hypotension (abnormally low blood pressure)
Loss of consciousness
Pneumonia
Pulse absent
Syncope (loss of consciousness with an inability to maintain postural tone)

20-29:

n/a

30-39:

n/a

40-49:

n/a

50-59:

Asthenia (weakness)
Chest pain
Glucose tolerance impaired (blood glucose is raised beyond normal levels, but not high enough to warrant a diabetes diagnosis)
Hypertension (high blood pressure)
Myalgia (muscle pain)
Myocardial infarction (destruction of heart tissue resulting from obstruction of the blood supply to the heart muscle)
Respiratory disorder (respiratory disease)
Urticaria (rash of round, red welts on the skin that itch intensely)

60+:

n/a

What are the existing conditions these people have? *

Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 9 people, 56.25%
Nausea (feeling of having an urge to vomit): 5 people, 31.25%
Migraine (headache): 4 people, 25.00%
Gallstones (stone formation by bile component): 4 people, 25.00%
Cataplexy (loss of muscle tone accompanied by full conscious awareness): 4 people, 25.00%
Blood Testosterone Decreased: 4 people, 25.00%
Rheumatoid Arthritis (a chronic progressive disease causing inflammation in the joints): 2 people, 12.50%
Pharyngitis Streptococcal (inflammation of the pharynx caused by infection from. streptococcus): 1 person, 6.25%
Joint Pain: 1 person, 6.25%
Hypersensitivity: 1 person, 6.25%

* Approximation only. Some reports may have incomplete information.

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