Quick Answer: How Quickly Does Zyrtec Work?

Is it bad to take 2 Zyrtec?

There have been reports of patients taking 15-18 times the recommended dose of Zyrtec (recommended dose is 10 mg) and having some adverse effects (restlessness, irritability, somnolence).

Taking two 10mg tablets should not cause you to have any serious problems..

What drugs should not be taken with antihistamines?

Some products that may interact with this drug are: antihistamines applied to the skin (such as diphenhydramine cream, ointment, spray), blood pressure medications (especially guanethidine, methyldopa, beta blockers such as atenolol, or calcium channel blockers such as nifedipine).

What is the strongest allergy medicine?

Zyrtec Prescription-Strength Allergy Medicine Tablets This medicine claims bragging rights as the number one allergist-recommended brand of OTC oral antihistamines for both indoor and outdoor allergies. It promises to start working within one hour after you take it and provides relief for up to 24 hours.

Is Zyrtec the same as Benadryl?

Zyrtec and Benadryl are both antihistamines that help relieve allergy symptoms. Benadryl is a first-generation antihistamine and tends to cause more side effects. Zyrtec is a second-generation antihistamine and causes fewer side effects.

Is Zyrtec bad for your liver?

Cetirizine (Includes Zyrtec) ↔ renal/liver disease Cetirizine is eliminated primarily by the kidney but also undergoes metabolism in the liver to some extent. Patients with renal and/or liver disease may be at greater risk for adverse effects from cetirizine due to decreased drug clearance.

Can Zyrtec cause anxiety?

Antihistamines are known to cause extreme drowsiness; however, in certain people, they can cause insomnia, excitability, anxiety, restlessness, and a rapid heart rate.

Is it better to take Zyrtec at night or in the morning?

Cetirizine can be taken at any time of the day. In most people it is non-sedating, so they take it in the morning. However, a percentage of people do find it to be sedating so if it does make you drowsy it is best to take it in the evening. Cetirizine can be taken with or without food.

Is it OK to take Zyrtec everyday?

Can be taken once a day. May be given daily on a regular basis when allergens are most prevalent (such as during spring or summer). Zyrtec does not appear to interact with many drugs (theophylline slightly decreased the clearance of Zyrtec). Zyrtec has been demonstrated to be safe in children older than 6 months.

Is Zyrtec or Claritin better?

Regardless of marketing claims, little scientific evidence shows that either is more effective. Zyrtec and Claritin have different active compounds. Zyrtec contains cetirizine hydrochloride, also called cetirizine HCL, while Claritin contains loratadine. Zyrtec and Claritin are second-generation antihistamines.

How long does it take for antihistamine to kick in?

Usually, antihistamine tablets start to work within 30 minutes after being taken and tend to be most effective within 1-2 hours after being taken. Antihistamines are more effective when taken regularly as a prevention, before symptoms occur, rather than only when you have symptoms.

Does Zyrtec cause weight gain?

Antihistamines that can cause weight gain include: Diphenhydramine (Benadryl and others) Cetirizine (Zyrtec)

What is the fastest acting antihistamine?

Chlorphenamine and Cetirizine are fast acting antihistamines and take 15-20 minutes to work. Some others take much longer. For anyone at risk of a severe allergic reaction (known as anaphylaxis), an adrenaline auto-injector (AAI) will be prescribed as well as antihistamines.

Can Zyrtec calm anxiety?

Antihistamines work by having a calming effect on the brain, helping you to feel less anxious.

Can I take 2 antihistamines a day?

As well as taking a non-drowsy antihistamine like loratadine during the day, your doctor may tell you to take a sedating antihistamine at night if the itching is making it difficult to sleep. Do not take 2 antihistamines together unless recommended by your doctor.

What is a good substitute for Zyrtec?

Antihistamines available OTC without a prescription include:cetirizine (Zyrtec)levocetirizine (Xyzal)brompheniramine.chlorpheniramine (Chlor-Trimeton)clemastine.diphenhydramine (Benadryl)fexofenadine (Allegra)loratadine (Alavert, Claritin)