Levothroid and Herceptin drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Levothroid (levothyroxine sodium) and Herceptin (trastuzumab). Common drug interactions include alopecia among females.

The phase IV clinical study analyzes what interactions people have when they take Levothroid and Herceptin. It is created by eHealthMe based on reports of 15 people who take the same drugs from the FDA, and is updated regularly.

What is Levothroid?

Levothroid has active ingredients of levothyroxine sodium. It is often used in hypothyroidism. eHealthMe is studying from 8,974 Levothroid users. Check the latest studies of Levothroid.

What is Herceptin?

Herceptin has active ingredients of trastuzumab. It is often used in breast cancer. eHealthMe is studying from 42,205 Herceptin users. Check the latest studies of Herceptin.

On Jul, 16, 2026

15 people who take Levothroid and Herceptin together, and have interactions are studied.

Levothroid and Herceptin drug interactions.

What are the common drug interactions of Levothroid and Herceptin, by gender? *:

female:

Alopecia (absence of hair from areas of the body)
Dyspnoea (difficult or laboured respiration)
Hair colour changes
Hair disorder
Pain
Peripheral embolism (sudden interruption of blood flow to an organ or body part)
Pleural effusion (water on the lungs)
Psychological trauma
Tachypnoea (a condition of rapid breathing over 20 per minute)
Pneumothorax (the presence of air or gas in the cavity between the lungs and the chest wall, causing collapse of the lung)

male:

n/a

What are the common drug interactions of Levothroid and Herceptin, 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:

Pneumothorax (the presence of air or gas in the cavity between the lungs and the chest wall, causing collapse of the lung)
Alopecia (absence of hair from areas of the body)
Psychological trauma

50-59:

Alopecia (absence of hair from areas of the body)
Cardiac failure
Cardiac failure congestive
Dyspnoea (difficult or laboured respiration)
Ejection fraction decreased (systolic heart failure)
Pleural effusion (water on the lungs)
Tachypnoea (a condition of rapid breathing over 20 per minute)

60+:

Alopecia (absence of hair from areas of the body)
Blood glucose increased
Bone loss
Contusion (a type of hematoma of tissue in which capillaries)
Device failure
Dyspnoea (difficult or laboured respiration)
Hair colour changes
Hair disorder
Pain
Peripheral embolism (sudden interruption of blood flow to an organ or body part)

What are the existing conditions these people have? *

Breast Cancer Metastatic: 5 people, 33.33%
Nausea (feeling of having an urge to vomit): 3 people, 20.00%
Stress And Anxiety: 2 people, 13.33%
Insomnia (sleeplessness): 2 people, 13.33%
Breast Cancer Female: 2 people, 13.33%
Thyroid Diseases: 1 person, 6.67%
Osteoporosis (bones weak and more likely to break): 1 person, 6.67%
High Blood Pressure: 1 person, 6.67%
Feeling Of Relaxation: 1 person, 6.67%
Diabetes: 1 person, 6.67%

* Approximation only. Some reports may have incomplete information.

Do you take Levothroid and Herceptin?

- 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