Hi,
Benadryl contains
diphenhydramine that belongs to the group of medications known as antihistamines is used in the treatment of allergy and its associated symptoms like runny nose, sneezing, watery eyes, itching or rash,
hay fever,
common cold etc. But, stop taking Benadryl abruptly may cause some unpleasant symptoms that is known as withdrawal syndrome. Symptoms of withdrawal syndrome are nausea or vomiting,
dizziness, loss of appetite, diarrhea, difficulty sleeping, constant
restlessness, sweating, headache, anxiety etc.
These symptoms usually start within 48-96 hours after the last dose of Benadryl and may last up to 7days. Usually these symptoms are mild as well as self limiting and go away over time without treatment. But if these symptoms persist for long or bother you then you should consult your doctor first for medical attention.
Take care. Hope I have answered your question. Let me know if I can assist you further.
Regards,
Dr. Zubayer Alam, General And Family Physician