Yes, as long as you have no trouble with diphenhydramine on its own, you should be able to take them together. There are no known interactions.
There is over 100 different types of Anti Histamines that are on the market. Which one/ones are you talking about?
anti-histamines
The anti-histamines make you drowsey
Anti histamines and sometimes steroids are prescribed for allergies
There are many treatments for chemosis depending on what is causing the chemosis. If chemosis is caused by allergies one should take medicines like anti-histamines.
Yes it can do, the body produces histomines in an allergic reaction such as hayfever or pet hair allergies, so we take anti-histamines to counteract the symptoms.
WebMD has a lot of good and trustworthy information regarding a variety of health issues and medications. On their website you will be able to find reviews of different anti-histamines as well as information about how to take the medications and if they're safe to take during pregnancy or in combination with other medications.
it acts against histamines.
yes
yes
Yes, you should continue to take methotrexate unless your doctor advises you to stop.
Yes, sometimes vets do give methotrexate, but it is in combination with other medications, and usually in extreme cases. If you have human methotrexate, do not attempt to dose it to your dog. This should only be done under vet care. Methotrexate is fatal if not given correctly.