Donât get blown away by that big, intimidating word! We havenât introduced word roots yet. I just wanted to demonstrate the major parts of a medical term. Letâs see how prefix and suffix changes can alter the meaning of a term without changing its central meaning by keeping the root the same.
Making the world better, one answer at a time. Benadryl, or diphenhydramine hydrochloride, when taken by mouth, works within 15 to 60 minutes. When injected through a muscle, it takes 20 to 30 minutes to work.When injected through a vein, it works rapidly. The effects of diphenhydramine hydrochloride work for approximately 4 to 8 hours, regardless of the form in which it is taken.aking the world better, one answer at a time. Benadryl, or diphenhydramine hydrochloride, when taken by mouth, works within 15 to 60 minutes. When injected through a muscle, it takes 20 to 30 minutes to work. When injected through a vein, it works rapidly.
That depends on what your taking and how much. Generally, any medication taken orally takes about a half an hour to absorb, but everyone is different. Some OTC antihistamines, like benadryl, last about 4 to 6 hours. Others can last any where from 12 to 24 hours.t takes 30 to 45 minutes to take effect. I take zyrtec at 7 pm. these are both 24 hours tablets. But they don't last 24 hours. My doctor put me on both. I also take alavert 24 hour disolving tab.