Zyrtec and Synthroid drug interactions - from FDA reports


Drug interactions are reported among people who take Zyrtec and Synthroid together. This study is created by eHealthMe based on reports of 4,112 people who take Zyrtec and Synthroid from FDA, and is updated regularly.

How to use this study: bring a copy to your health teams to ensure drug risks and benefits are fully discussed and understood.


Peer to Peer mobile support

Peer support for this study is available on our Ginger Health app. It's free, anonymous and secure. The app is ideal for people taking multiple medications or having multiple conditions.



On Feb, 16, 2019

4,112 people who take Zyrtec, Synthroid are studied.


Number of reports submitted per year:

Zyrtec and Synthroid drug interactions.

Most common drug interactions over time *:

< 1 month:
  1. Somnolence (a state of near-sleep, a strong desire for sleep)
  2. Blood pressure increased
  3. Drug ineffective
  4. Fall
  5. Diarrhoea
  6. Headache (pain in head)
  7. Back pain
  8. Dizziness
  9. Hypersensitivity
  10. Lethargy (tiredness)
1 - 6 months:
  1. Palpitations (feelings or sensations that your heart is pounding or racing)
  2. Gastrooesophageal reflux disease (stomach contents (food or liquid) leak backwards from the stomach into the oesophagus)
  3. Hypertension (high blood pressure)
  4. Pollakiuria (abnormally frequent passage of relatively small quantities or urine)
  5. Blood creatine phosphokinase increased
  6. Cough
  7. Dizziness
  8. Fall
  9. Rhabdomyolysis (a condition in which damaged skeletal muscle tissue breaks down)
  10. Therapeutic response unexpected
6 - 12 months:
  1. Pain
  2. Back pain
  3. Headache (pain in head)
  4. Nausea (feeling of having an urge to vomit)
  5. Abdominal pain
  6. Accelerated hypertension (significant hypertension)
  7. Anxiety
  8. Blood thyroid stimulating hormone decreased
  9. Blood thyroid stimulating hormone increased
  10. Cardiac murmur (an heart sound in valve abnormality)
1 - 2 years:
  1. Vision blurred
  2. Anxiety
  3. Weight increased
  4. Blood thyroid stimulating hormone increased
  5. Pruritus (severe itching of the skin)
  6. Urticaria (rash of round, red welts on the skin that itch intensely)
  7. Amnesia (deficit in memory caused by brain damage, disease, or psychological trauma)
  8. Asthenia (weakness)
  9. Attention deficit/hyperactivity disorder
  10. Cognitive disorder (mental health disorders affects learning, memory, perception, and problem solving)
2 - 5 years:
  1. Anxiety
  2. Deep vein thrombosis (blood clot in a major vein that usually develops in the legs and/or pelvis)
  3. Abscess limb (limb infection)
  4. Arthropathy
  5. Condition
  6. Depression
  7. Fatigue (feeling of tiredness)
  8. Gastrooesophageal reflux disease (stomach contents (food or liquid) leak backwards from the stomach into the oesophagus)
  9. Headache (pain in head)
  10. Heart rate increased
5 - 10 years:
  1. Dementia (madness)
  2. Gastrooesophageal reflux disease (stomach contents (food or liquid) leak backwards from the stomach into the oesophagus)
  3. Headache (pain in head)
  4. Incoherent (talking in a confused and unclear way)
  5. Neck pain
  6. Osteoporosis (bones weak and more likely to break)
  7. Pruritus (severe itching of the skin)
  8. Pyrexia (fever)
  9. Rotator cuff syndrome (a spectrum of conditions affecting the rotator cuff tendons of the shoulder)
  10. Transient ischaemic attack (a transient episode of neurologic dysfunction caused by ischemia (loss of blood flow))
10+ years:
  1. Arthralgia (joint pain)
  2. Cataplexy (loss of muscle tone accompanied by full conscious awareness)
  3. Fall
  4. Gastrointestinal infection (infection of stomach and intestine)
  5. Hypersensitivity
  6. Knee arthroplasty
  7. Muscle fatigue (a condition in which muscles cannot exert their normal force)
  8. Nausea (feeling of having an urge to vomit)
  9. Oropharyngeal pain
  10. Acute myocardial infarction (acute heart attack)
not specified:
  1. Nausea (feeling of having an urge to vomit)
  2. Fatigue (feeling of tiredness)
  3. Pain
  4. Headache (pain in head)
  5. Dyspnoea (difficult or laboured respiration)
  6. Diarrhoea
  7. Drug ineffective
  8. Fall
  9. Arthralgia (joint pain)
  10. Anxiety

Most common drug interactions by gender *:

male:
  1. Pain
  2. Nausea (feeling of having an urge to vomit)
  3. Fall
  4. Atrial fibrillation (fibrillation of the muscles of the atria of the heart)
  5. Headache (pain in head)
  6. Hypotension (abnormally low blood pressure)
  7. Injury
  8. Cardiac failure
  9. Drug ineffective
  10. Weight decreased

Most common drug interactions by age *:

0-1:

n/a

2-9:
  1. Agitation (state of anxiety or nervous excitement)
  2. Anaphylactic reaction (serious allergic reaction)
  3. Convulsion (muscles contract and relax rapidly and repeatedly, resulting in an uncontrolled shaking of the body)
  4. Dyspnoea (difficult or laboured respiration)
  5. Flushing (the warm, red condition of human skin)
  6. Rash
  7. Tachycardia (a heart rate that exceeds the range of 100 beats/min)
  8. Tachypnoea (condition of rapid breathing over 20 per minute)
  9. Urticaria (rash of round, red welts on the skin that itch intensely)
  10. Adrenal insufficiency (condition in which the adrenal glands do not produce adequate amounts of steroids)
10-19:
  1. Hypertension (high blood pressure)
  2. Headache (pain in head)
  3. Pain
  4. Anhedonia (inability to experience pleasure from activities usually found enjoyable)
  5. Anxiety
  6. Deep vein thrombosis (blood clot in a major vein that usually develops in the legs and/or pelvis)
  7. Paraesthesia (sensation of tingling, tickling, prickling, pricking, or burning of a person's skin with no apparent long-term physical effect)
  8. Rhinorrhoea (watery mucus discharge from the nose)
  9. Fatigue (feeling of tiredness)
  10. Hypoxia (low oxygen in tissues)
20-29:
  1. Cough
  2. Pain
  3. Vomiting
  4. Injury
  5. Nausea (feeling of having an urge to vomit)
  6. Emotional distress
  7. Chest pain
  8. Cholelithiasis (the presence or formation of gallstones in the gallbladder or bile ducts)
  9. Drug ineffective
  10. Abdominal pain
30-39:
  1. Anxiety
  2. Pain
  3. Injury
  4. Nausea (feeling of having an urge to vomit)
  5. Headache (pain in head)
  6. Depression
  7. Fatigue (feeling of tiredness)
  8. Dyspnoea (difficult or laboured respiration)
  9. Gastrooesophageal reflux disease (stomach contents (food or liquid) leak backwards from the stomach into the oesophagus)
  10. Back pain
40-49:
  1. Nausea (feeling of having an urge to vomit)
  2. Headache (pain in head)
  3. Fatigue (feeling of tiredness)
  4. Pain
  5. Diarrhoea
  6. Arthralgia (joint pain)
  7. Vomiting
  8. Dyspnoea (difficult or laboured respiration)
  9. Anxiety
  10. Oedema peripheral (superficial swelling)
50-59:
  1. Dyspnoea (difficult or laboured respiration)
  2. Diarrhoea
  3. Weight decreased
  4. Pyrexia (fever)
  5. Dizziness
  6. Drug ineffective
  7. Pain in extremity
  8. Fall
  9. Oedema peripheral (superficial swelling)
  10. Back pain
60+:
  1. Fatigue (feeling of tiredness)
  2. Dyspnoea (difficult or laboured respiration)
  3. Back pain
  4. Arthralgia (joint pain)
  5. Cough
  6. Drug ineffective
  7. Rash
  8. Malaise (a feeling of general discomfort or uneasiness)
  9. Hypertension (high blood pressure)
  10. Pain in extremity

* Approximation only. Some reports may have incomplete information.

Do you take Zyrtec and Synthroid?


You are not alone:




Related studies

Zyrtec

Zyrtec has active ingredients of cetirizine hydrochloride. It is often used in allergies. (latest outcomes from Zyrtec 67,869 users)

Synthroid

Synthroid has active ingredients of levothyroxine sodium. It is often used in hypothyroidism. (latest outcomes from Synthroid 170,727 users)


Browse by gender and age

Female: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+

Male: 0-1 2-9 10-19 20-29 30-39 40-49 50-59 60+


Interactions between Zyrtec and drugs from A to Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
Interactions between Synthroid and drugs from A to Z
a b c d e f g h i j k l m n o p q r s t u v w x y z
Browse all drug interactions of Zyrtec and Synthroid
a b c d e f g h i j k l m n o p q r s t u v w x y z

What would happen?

Predict new side effects and undetected conditions when you take Zyrtec and Synthroid (63,377 reports studied)

FDA reports used in this study



Recent updates

Recent general studies
Recent personal studies

NOTE: The study is based on active ingredients and brand name. Other drugs that have the same active ingredients (e.g. generic drugs) are NOT considered.

WARNING: Please DO NOT STOP MEDICATIONS without first consulting a physician since doing so could be hazardous to your health.

DISCLAIMER: All material available on eHealthMe.com is for informational purposes only, and is not a substitute for medical advice, diagnosis, or treatment provided by a qualified healthcare provider. All information is observation-only, and has not been supported by scientific studies or clinical trials unless otherwise stated. Different individuals may respond to medication in different ways. Every effort has been made to ensure that all information is accurate, up-to-date, and complete, but no guarantee is made to that effect. The use of the eHealthMe site and its content is at your own risk.

You may report adverse side effects to the FDA at http://www.fda.gov/medwatch/ or 1-800-FDA-1088 (1-800-332-1088).

If you use this eHealthMe study on publication, please acknowledge it with a citation: study title, URL, accessed date.

Submit your testimonial

  • Please fill in your Testimonial.
  • Please enter a minimum of 10 characters for your Testimonial.
  • Please fill in your Name.

Please wait...

{progressItem}

Thank you!