Alfenta and Versed drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Alfenta (alfentanil hydrochloride) and Versed (midazolam hydrochloride). Common drug interactions include anaphylactic shock among females and myalgia among males.

The phase IV clinical study analyzes what interactions people have when they take Alfenta and Versed. It is created by eHealthMe based on reports of 13 people who take the same drugs from the FDA, and is updated regularly.

What is Alfenta?

Alfenta has active ingredients of alfentanil hydrochloride. eHealthMe is studying from 1,508 Alfenta users. Check the latest studies of Alfenta.

What is Versed?

Versed has active ingredients of midazolam hydrochloride. It is often used in sedation during medical procedure. eHealthMe is studying from 6,869 Versed users. Check the latest studies of Versed.

On Jul, 11, 2026

13 people who take Alfenta and Versed together, and have interactions are studied.

What are the common drug interactions of Alfenta and Versed, by gender? *:

female:

Anaphylactic shock (severe and rapid and sometimes fatal hypersensitivity reaction to a substance)
Atrioventricular block complete (heart block complete)
Axillary mass
Cardiac arrest
Chronic kidney disease
Cyanosis (lack of oxygen in body leads to blue appearance of skin ,mucous membrane nails)
Dermatitis (inflammation of the skin resulting from direct irritation by an external agent or an allergic reaction to it)
Hyperparathyroidism secondary (an abnormally high concentration of parathyroid hormone in the blood, resulting in weakening of the bones through loss of calcium-secondary)
Laryngospasm (an uncontrolled/involuntary muscular contraction of larynx)
Muscle tightness

male:

Myalgia (muscle pain)
Aggression
Paralysis
Agitation (state of anxiety or nervous excitement)
Arthralgia (joint pain)
Grand mal convulsion (a type of generalized seizure that affects the entire brain)
Loss of consciousness
Monoparesis (one limb is very weak, but not completely paralyzed)
Neuromuscular block prolonged
Pain

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

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

Axillary mass
Muscle tightness
Pain
Pain in jaw

30-39:

Dermatitis (inflammation of the skin resulting from direct irritation by an external agent or an allergic reaction to it)
Neuromuscular block prolonged

40-49:

Cardiac arrest
Pulmonary oedema (fluid accumulation in the lungs)

50-59:

n/a

60+:

Aggression
Grand mal convulsion (a type of generalized seizure that affects the entire brain)
Cyanosis (lack of oxygen in body leads to blue appearance of skin ,mucous membrane nails)
Hyperparathyroidism secondary (an abnormally high concentration of parathyroid hormone in the blood, resulting in weakening of the bones through loss of calcium-secondary)
Laryngospasm (an uncontrolled/involuntary muscular contraction of larynx)
Monoparesis (one limb is very weak, but not completely paralyzed)
Pain
Pain in extremity
Paralysis
Renal failure (kidney dysfunction)

What are the existing conditions these people have? *

Sinusitis (inflammation of sinus): 1 person, 7.69%
Lower Respiratory Tract Infection: 1 person, 7.69%
High Blood Pressure: 1 person, 7.69%
Headache (pain in head): 1 person, 7.69%
Gastroesophageal Reflux Disease (a condition in which stomach contents leak backward from the stomach into the oesophagus): 1 person, 7.69%

* Approximation only. Some reports may have incomplete information.

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