Tiazac and Keflex drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Tiazac (diltiazem hydrochloride) and Keflex (cephalexin). Common drug interactions include body tinea among females and angina unstable among males.

The phase IV clinical study analyzes what interactions people have when they take Tiazac and Keflex. It is created by eHealthMe based on reports of 20 people who take the same drugs from the FDA, and is updated regularly.

What is Tiazac?

Tiazac has active ingredients of diltiazem hydrochloride. It is often used in high blood pressure. eHealthMe is studying from 4,761 Tiazac users. Check the latest studies of Tiazac.

What is Keflex?

Keflex has active ingredients of cephalexin. It is often used in infection. eHealthMe is studying from 15,844 Keflex users. Check the latest studies of Keflex.

On Jul, 11, 2026

20 people who take Tiazac and Keflex together, and have interactions are studied.

What are the common drug interactions of Tiazac and Keflex, by gender? *:

female:

Body tinea (ringworm of the body)
Bronchitis chronic (inflammation of the mucous membrane in the bronchial tubes- chronic)
Diarrhoea
Essential hypertension (primary hypertension)
Facial palsy (paralysis of face nerve)
Herpes simplex (herpes simplex is a common viral infection)
Herpes simplex ophthalmic (eye infection is caused by a type of herpes simplex virus)
Hordeolum (small collection of pus (abscess) on the eyelid)
Otitis media acute (rapid inflammation of the middle ear)
Pain

male:

Angina unstable (chest pain due to ischemia of the heart muscle- unstable)
Dyspnoea (difficult or laboured respiration)
Oedema peripheral (superficial swelling)
Pollakiuria (abnormally frequent passage of relatively small quantities or urine)
Sexual dysfunction (difficulty experienced by an individual or a couple during any stage of a normal sexual activity)
Sleep disorder
Suicidal ideation
Suicide attempt
Appetite disorder (abnormal eating habits)
Blister (small pocket of fluid within the upper layers of the skin caused by forceful rubbing (friction), burning, freezing, chemical exposure)

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

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

Abscess (pus)
Arthrodesis
Basedow's disease (autoimmune disease where the thyroid is overactive, producing an excessive amount of thyroid hormones)
Body tinea (ringworm of the body)
Bronchitis chronic (inflammation of the mucous membrane in the bronchial tubes- chronic)
Depression
Diarrhoea
Essential hypertension (primary hypertension)
Facial palsy (paralysis of face nerve)
Gastrooesophageal reflux disease (stomach contents (food or liquid) leak backwards from the stomach into the oesophagus)

30-39:

Pain
Abortion (termination of pregnancy)
Anhedonia (inability to experience pleasure from activities usually found enjoyable)
Anxiety
Asthma
Bronchitis acute (acute inflammation of the mucous membrane in the bronchial tubes)
Chest pain
Chest tightness
Complications of maternal exposure to therapeutic drugs
Depression

40-49:

Hallucination, auditory (perceiving sounds without auditory stimulus)
Headache (pain in head)
Multiple drug overdose
Oedema peripheral (superficial swelling)
Pollakiuria (abnormally frequent passage of relatively small quantities or urine)
Sexual dysfunction (difficulty experienced by an individual or a couple during any stage of a normal sexual activity)
Sleep disorder
Suicidal ideation
Suicide attempt
Appetite disorder (abnormal eating habits)

50-59:

Chronic kidney disease
Drug hypersensitivity
Renal failure (kidney dysfunction)
Renal injury (kidney injury)

60+:

Chronic kidney disease
Hyperparathyroidism secondary (an abnormally high concentration of parathyroid hormone in the blood, resulting in weakening of the bones through loss of calcium-secondary)
Agitation (state of anxiety or nervous excitement)
Anaemia (lack of blood)
Anaemia megaloblastic (disorder of abnormally large red blood cells)
Angina pectoris (chest pain due to ischemia of the heart muscle)
Angina unstable (chest pain due to ischemia of the heart muscle- unstable)
Angioplasty
Anhedonia (inability to experience pleasure from activities usually found enjoyable)
Arrhythmia (irregular heartbeat)

What are the existing conditions these people have? *

Pain: 8 people, 40.00%
Cardiac Failure Congestive: 3 people, 15.00%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 3 people, 15.00%
Gastric Disorder (disease of stomach): 3 people, 15.00%
Fluid Retention (an abnormal accumulation of fluid in the blood): 2 people, 10.00%
Back Pain: 2 people, 10.00%
Insomnia (sleeplessness): 2 people, 10.00%
Hypersensitivity: 2 people, 10.00%
High Blood Cholesterol: 2 people, 10.00%
Gout (uric acid crystals building up in the body): 2 people, 10.00%

* Approximation only. Some reports may have incomplete information.

Do you take Tiazac and Keflex?

- 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