Phentermine and Cetirizine hydrochloride drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Phentermine (phentermine hydrochloride) and Cetirizine hydrochloride (cetirizine hydrochloride). Common drug interactions include headache among females and anhedonia among males.

The phase IV clinical study analyzes what interactions people have when they take Phentermine and Cetirizine hydrochloride. It is created by eHealthMe based on reports of 26 people who take the same drugs from the FDA, and is updated regularly.

What is Phentermine?

Phentermine has active ingredients of phentermine hydrochloride. It is often used in weight loss. eHealthMe is studying from 19,870 Phentermine users. Check the latest studies of Phentermine.

What is Cetirizine hydrochloride?

Cetirizine hydrochloride has active ingredients of cetirizine hydrochloride. It is often used in allergies. eHealthMe is studying from 34,908 Cetirizine hydrochloride users. Check the latest studies of Cetirizine hydrochloride.

On Jul, 13, 2026

26 people who take Phentermine and Cetirizine hydrochloride together, and have interactions are studied.

Phentermine and Cetirizine hydrochloride drug interactions.

What are the common drug interactions of Phentermine and Cetirizine Hydrochloride, by gender? *:

female:

Headache (pain in head)
Abdominal discomfort
Arthralgia (joint pain)
Back disorder
Musculoskeletal discomfort (discomfort in the body's muscles, joints, tendons, ligaments and nerves)
Sinusitis (inflammation of sinus)
Chronic kidney disease
Hernia (hernia happens when part of an internal organ or tissue bulges through a weak area of muscle)
Sinus congestion (blockage of sinus)
Gastrooesophageal reflux disease (stomach contents (food or liquid) leak backwards from the stomach into the oesophagus)

male:

Anhedonia (inability to experience pleasure from activities usually found enjoyable)
Anxiety
Osteoporosis (bones weak and more likely to break)
Pain
Quality of life decreased
Spinal compression fracture (fracture due to spinal compression on bone)
Weight increased
Decreased activity
Drug ineffective
Emotional distress

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

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

Cardiac flutter (abnormal heart rhythm)
Hyperhidrosis (abnormally increased sweating)
Gallbladder operation

30-39:

Asthma
Blister (small pocket of fluid within the upper layers of the skin caused by forceful rubbing (friction), burning, freezing, chemical exposure)
Drug ineffective
Oropharyngeal pain

40-49:

Arthralgia (joint pain)
Dry mouth
Gait disturbance
Lip dry
Pruritus (severe itching of the skin)
Therapeutic response unexpected

50-59:

Chronic kidney disease
Arthralgia (joint pain)
Gastrooesophageal reflux disease (stomach contents (food or liquid) leak backwards from the stomach into the oesophagus)
Impaired gastric emptying
Renal failure (kidney dysfunction)
Asthenia (weakness)
Back pain
Bone pain
Chest discomfort
Dyspnoea (difficult or laboured respiration)

60+:

Anhedonia (inability to experience pleasure from activities usually found enjoyable)
Anxiety
Quality of life decreased
Spinal compression fracture (fracture due to spinal compression on bone)
Weight increased
Decreased activity
Emotional distress
Fracture
Kyphosis (a condition of over-curvature of the thoracic vertebrae (upper back))
Mobility decreased (ability to move is reduced)

What are the existing conditions these people have? *

Narcolepsy (brain's inability to regulate sleep-wake cycles normally): 5 people, 19.23%
Cataplexy (loss of muscle tone accompanied by full conscious awareness): 4 people, 15.38%
Immunodeficiency Common Variable: 4 people, 15.38%
Hypersensitivity: 3 people, 11.54%
Multiple Allergies (allergy to multiple agents): 3 people, 11.54%
Pain: 3 people, 11.54%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 3 people, 11.54%
High Blood Pressure: 3 people, 11.54%
High Blood Cholesterol: 2 people, 7.69%
Asthma: 2 people, 7.69%

* Approximation only. Some reports may have incomplete information.

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