Antihistamines are drugs used to treat allergic symptoms like sneezing, itchy eyes, watery eyes, hives, runny nose, and blocked nose. Some antihistamines are also used for motion sickness, vomiting, dizziness, anxiety, Parkinson's disease, and sleep problems. Fexofenadine, Hydroxyzine, Diphenhydramine, Chlorpheniramine, Loratadine, and Levocetirizine are a few examples of antihistamines.

Recently Answered Questions Recently Answered Questions

All the answers published in this website are written by verified medical doctors, therapists and health experts. The Content has been moderated by iCliniq medical review team before publication. Post your medical clarifications on iCliniq by choosing the right specialty and get them answered. Your medical queries will be answered 24/7 by top doctors from iCliniq.

Why am I having itchy rashes and bumps on my skin at the time of periods?

Query: Hi doctor, I am a 31 year old female. I have rashes and bumps, that itch and look like they are big bites, but they are not. They come and go in different places and are more frequent around the time of my periods. I have had these bumps for seven months now. I am attaching a picture, what are these...  Read Full »

Dr. Shaikh Sadaf

Answer: Hello, Welcome to I just read your query and saw the attachment provided by you (attachment removed to protect patient identity), and it appears that you have urticaria or hives in simpler terms. These usually occur when your immune system is a bit low such as during your periods, af...  Read Full »

My father took Benadryl for food allergy. Can he take his diabetes medicines?

Query: Hello doctor, My father had two pieces of large clams last night, and he experienced a food allergy to them. He complained about tingling sensation and swelling of his eyes. I gave him one tablet of Co-Altria Ped 5 mg at night. He is 63 years old and diabetic for a year. He uses Insulin injection, L...  Read Full »

Dr. Radela Yvonne L. Ramos-cortes

Answer: Hello, Welcome to Thanks for your query. I assume that your father already has a known allergy to crustaceans because you identified clam as the source of his allergy. It was good that you gave him Co-Altria Ped 5 mg (Montelukast, Levocetirizine, and Dihydrochloride) and Benadr...  Read Full »

What is the safe dosage of Fexofenadine for adults?

Query: Hi doctor, I have trouble breathing with occasional cough, sticky mucus in the back of my throat, and there is always a need for clearing my throat. I am experiencing a tight chest, the feel of rubbing it constantly, constant sneezing. I also have itching all over the body. All my symptoms exist ...  Read Full »

Dr. Shyam Kalyan. N

Answer: Hello,Welcome to going through the detailed history you have given, I also feel they are allergies only. Now we need to do a few things. I suggest skin prick allergy testing to diagnose what you are allergic to, and we can direct our treatment toward those. Before the test, you nee...  Read Full »

Will laser cauterization help in overcoming allergic rhinitis?

Query: Hi doctor, I have been suffering from severe sneezing for 24 months. I have been taking Aerius during my pregnancy as it was the safest medicine, but it became worst after the delivery of my baby. I literally cannot stop sneezing. I took Dymista. It was working in the beginning, and then it stopped....  Read Full »

Dr. Shyam Kalyan. N

Answer: Hi, Welcome to It would help if you got the following tests before we decide on any form of treatment, surgery, or medical: 1) Skin prick allergy testing to find out what you are allergic to. If this test is not available, then please do a comprehensive blood allergy profile. Based o...  Read Full »

What causes intermittent frontal, occipital and parietal upper sinus pain with dizziness?

Query: Hi doctor, My mother, 72 years old, is having intermittent frontal, occipital, and parietal upper sinus pain and pressure with dizziness. I took her to the ER last week because she was having dizziness blurred vision and pain. They did a CT scan and it came back negative for any lesions. What can I ...  Read Full »

Dr. Shyam Kalyan. N

Answer: Hello, Welcome to I am giving you some suggestions in the wake of the conversation we had. The symptoms are not classical of ENT sinus headache. It appears more neurological. Meclizine is a strong antihistaminic with anti-vertigo properties based on its central nervous system depressa...  Read Full »

Kindly suggest treatment option for physical urticaria by heat, physical effort and tension.

Query: Hello doctor, I am 22 years old. I need treatment for physical urticaria through heat, physical effort, and tension.  Read Full »

Dr. Amol Kumar Wasudeorao Diwan

Answer: Hello, Welcome to You told me about your problem with physical urticaria. Tests advised are CBC (complete blood count), ESR (erythrocyte sedimentation rate), ANA (antinuclear antibody), cryoglobulin, HBsAg (hepatitis B virus antigen), and anti-HCV Ab (hepatitis C antibody). The first...  Read Full »

Does vasoconstriction occur due to an allergy to antihistamines?

Query: Hi doctor, I am having major vasoconstriction problems. I would like to know if my daily antihistamines intake is causing this problem. I am taking Loratadine and Fexofenadine hydrochloride daily for allergies.  Read Full »

Dr. Naval Mendiratta

Answer: Hi, Welcome to I would like to know in detail, what you mean by vasoconstriction problems? Is it affecting your hands or your feet or anywhere in the nasal bed? Do you experience any bluish discoloration of the nails or hands? Do you have any pain in the hands or feet? Do you have ul...  Read Full »

I have a constant runny nose for three years. How to get cured?

Query: Hi doctor, I have had a constant runny and congested nose for three years. After years of trying anything possible and seeing several doctors, I was finally diagnosed with a severe dust allergy, as well as asthma by last year. At that time I was pregnant, so I could not be prescribed any medication,...  Read Full »

Dr. Shyam Kalyan. N

Answer: Hello, Welcome to Allergy and asthma belong to airway hyper-reactive disorders that are interrelated. The two are hypersensitivity reactions and are genetically determined. A permanent cure for allergy remained evasive for a long time, but now with the advent of immunotherapy, a treat...  Read Full »

Can you take Tylenol with Amoxicillin?

Query: Hi doctor, Yesterday, I had my wisdom tooth extracted. I received a prescription for Tylenol 3 (equivalent to Acetaminophen 300 mg and Codeine 30 mg) for pain and Amoxicillin (500 mg) to prevent infection. I immediately took one Amoxicillin as I walked out of the dental office and for the rest of th...  Read Full »

Dr. Pooja Pardhi

Answer: Hi. Welcome to I have gone through your query and can understand your health concern. The allergic reaction can be due to Amoxicillin only, because Acetaminophen and Codeine will not cause any allergic reaction. I suggest you to stop Amoxicillin. You can use any of the Cephalosporin i...  Read Full »

From the last 10 years, I am suffering from allergies. Please help.

Query: Hello doctor, For the past 10 years, I am suffering from an allergy. The doctors informed me that due to allergy there is an excess histamine produced in my body. My allergic symptoms are nasal congestion, sneezing, anxiety, frequent throat infection, shortness of breath, and some kind of discomfort...  Read Full »

Dr. Shyam Kalyan. N

Answer: Hello, Welcome to I can understand your concerns. Having allergy can cause a lot of discomfort in life, affect the quality of life, and result in anxiety and depression eventually. But, you need not worry. We have solutions for allergy. First, let us understand how allergy occurs. A...  Read Full »

ask-doctor-img Ask a Doctor Online

* Your first query consult is free!

Search for a Health Issue

Disclaimer: No content published on this website is intended to be a substitute for professional medical diagnosis, advice or treatment by a trained physician. Seek advice from your physician or other qualified healthcare providers with questions you may have regarding your symptoms and medical condition for a complete medical diagnosis. Do not delay or disregard seeking professional medical advice because of something you have read on this website. Read our Editorial Process to know how we create content for health articles and queries.