An antihistamine helps relieve symptoms often associated with allergies, such as a runny nose or watery eyes.  The common cold causes similar symptoms, so antihistamines can be an effective treatment. A common side effect of antihistamines is dry mouth, so you may feel thirsty without actually being dehydrated.
Does allergy medicine make you dehydrated?
Medications can also affect your level of hydration. Certain antihistamines, blood pressure medicines, laxatives, diuretics and chemotherapies can cause dehydration.
Do allergy pills cause dry mouth?
Antihistamines used for allergies and asthma also cause dry mouth. Atarax and Vistaril (hydroxyzine hydrochloride), Clarinex (desloratadine), Xyzal (levocetirizine), Allegra (fexofenadine), Benadryl (diphenhydramine), Claritin (loratadine) and Zyrtec (cetirizine) can all leave you with a dry mouth.
Why do antihistamines cause dry mouth?
Abstract. One of the common side effects of antihistamine medicines is xerostomia (dry mouth). The current consensus is that antihistamine-induced xerostomia comes from an antimuscarinic effect.
Does Benadryl make you dehydrated?
Benadryl (Diphenhydramine) can make you dehydrated, so avoid this side effect by drinking plenty of fluids. Benadryl (Diphenhydramine) makes you tired, so take it before you go to sleep. Don’t take it with alcohol or other drugs that make you sleepy.
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 fastest way to cure dehydration?
Dehydration occurs when your body loses more fluids than it takes in. For most people, drinking water is the best way to stay hydrated and rehydrate. Other options include coffee, tea, milk, fruits, vegetables, and oral hydration solutions.
Do allergies dry you out?
Seasonal allergies like allergic rhinitis (hay fever) can keep the sinuses irritated, causing the tissue to become dry and inflamed.
Why is my mouth dry even though I drink a lot of water?
Dry mouth can occur as a result of dehydration if you’re not drinking enough fluids. Dehydration isn’t always the cause of dry mouth, but sipping water can still help wash away bacteria in your mouth until your saliva flow returns to normal.
Does seasonal allergies cause dry mouth?
Allergies can cause dry mouth in two ways. First, you’re more likely to breathe through your mouth when your nose is stuffy. Second, many antihistamines include dry mouth as a side effect. This condition isn’t just uncomfortable — it also increases your chances of developing cavities, gum disease and bad breath.
Do antihistamines cause weight gain?
Do antihistamines cause weight gain? The short answer seems to be yes. While occasionally taking a Benadryl for sleep probably won’t lead to significant weight gain, chronic use of antihistamines can interfere with weigh loss efforts.
How long does dry mouth last after antihistamine?
Some antihistamines are more likely to cause dryness of the mouth than others . For temporary relief of mouth dryness, use sugarless candy or gum, melt bits of ice in your mouth, or use a saliva substitute. However, if your mouth continues to feel dry for more than 2 weeks, check with your medical doctor or dentist.
Is it OK to take antihistamines every day?
Depending on your symptoms, you can take antihistamines: Every day, to help keep daily symptoms under control. Only when you have symptoms. Before being exposed to things that often cause your allergy symptoms, such as a pet or certain plants.
What are the negative effects of Benadryl?
Drowsiness, dizziness, constipation, stomach upset, blurred vision, or dry mouth/nose/throat may occur. If any of these effects persist or worsen, tell your doctor or pharmacist promptly.
Who should not take Benadryl?
Who should not take BENADRYL ALLERGY?
- overactive thyroid gland.
- increased pressure in the eye.
- closed angle glaucoma.
- high blood pressure.
- stenosing peptic ulcer.
- blockage of the urinary bladder.
- enlarged prostate.
- an inability to completely empty the bladder.
Why does Benadryl make me feel weird?
The Medication Does Make You Sleepy…
It works by blocking histamine, a chemical produced by the central nervous system that not only produces allergy symptoms, but plays a role in wakefulness (hence the insta-drowsy feeling after you pop a Benadryl).