Claritin and Firdapse drug interactions - a phase IV clinical study of FDA data

Summary:

Drug interactions are reported among people who take Claritin (loratadine) and Firdapse (amifampridine). Common drug interactions include asthenia among females and drug ineffective among males.

The phase IV clinical study analyzes what interactions people have when they take Claritin and Firdapse. It is created by eHealthMe based on reports of 32 people who take the same drugs from the FDA, and is updated regularly.

What is Claritin?

Claritin has active ingredients of loratadine. It is often used in allergies. eHealthMe is studying from 77,315 Claritin users. Check the latest studies of Claritin.

What is Firdapse?

Firdapse has active ingredients of amifampridine. eHealthMe is studying from 2,112 Firdapse users. Check the latest studies of Firdapse.

On Jul, 12, 2026

32 people who take Claritin and Firdapse together, and have interactions are studied.

Claritin and Firdapse drug interactions.

What are the common drug interactions of Claritin and Firdapse, by gender? *:

female:

Asthenia (weakness)
Atrial fibrillation (fibrillation of the muscles of the atria of the heart)
Muscular weakness (muscle weakness)
Headache (pain in head)
Insomnia (sleeplessness)
Abdominal pain upper
Paraesthesia (sensation of tingling, tickling, prickling, pricking, or burning of a person's skin with no apparent long-term physical effect)
Anxiety
Chest discomfort
Cough

male:

Drug ineffective
Dyspepsia (indigestion)
Leukoplakia (white and gray patches inside the mouth)
Gastrooesophageal reflux disease (stomach contents (food or liquid) leak backwards from the stomach into the oesophagus)
Body temperature increased
Dizziness
Heart rate increased
Infusion related reaction
Paraesthesia (sensation of tingling, tickling, prickling, pricking, or burning of a person's skin with no apparent long-term physical effect)
Blood pressure increased

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

0-1:

n/a

2-9:

n/a

10-19:

n/a

20-29:

n/a

30-39:

Abdominal pain upper
Hypoaesthesia (reduced sense of touch or sensation)
Hypoaesthesia oral (reduced sense of touch or sensation in mouth)
Lip dry
Nephrolithiasis (calculi in the kidneys)
Paraesthesia (sensation of tingling, tickling, prickling, pricking, or burning of a person's skin with no apparent long-term physical effect)
Paraesthesia oral (sensation of tingling, tickling, prickling, pricking, or burning of a person's oral with no apparent long-term physical effect)
Rhinorrhoea (watery mucus discharge from the nose)
Tremor (trembling or shaking movements in one or more parts of your body)

40-49:

n/a

50-59:

Fall
Joint dislocation (a joint position is changed from normal position)
Rib fracture
Syncope (loss of consciousness with an inability to maintain postural tone)

60+:

Asthenia (weakness)
Atrial fibrillation (fibrillation of the muscles of the atria of the heart)
Pain in extremity
Performance status decreased
Proteus infection (proteus can cause urinary tract infections)
Septic shock (shock due to blood infection)
Tremor (trembling or shaking movements in one or more parts of your body)
Urinary tract infection
Anxiety
Chest discomfort

What are the existing conditions these people have? *

Lambert-Eaton Syndrome (this means your immune system mistakenly targets healthy cells and tissues in the body): 31 people, 96.88%
Cellulitis (infection under the skin): 2 people, 6.25%

* Approximation only. Some reports may have incomplete information.

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