Common side effects may include: dizziness, drowsiness, loss of coordination; dry mouth, nose, or throat; constipation, upset stomach; dry eyes, blurred vision; or day-time drowsiness or "hangover" feeling after night-time use. Dizziness. Benadryl Childrens Allergy Fastmelt (diphenhydrAMINE)." "Product Information. Manage side effects with eHealthMe. Upset stomach or throwing up. Side Effects. Cerner Multum, Inc. "Australian Product Information." Thickening of mucus in nose or throat. Cerner Multum, Inc. "UK Summary of Product Characteristics." Parke-Davis, Morris Plains, NJ. Feeling nervous and excitable. Topical corticosteroids (Includes diphenhydramine/hydrocortisone/nystatin/tetracycline topical) ↔ diabetes. Available for Android and iOS devices.We comply with the HONcode standard for trustworthy health information - O 02. Drowsiness, dizziness, constipation, stomach upset, blurred vision, or dry mouth/nose/throat may occur. See below for a comprehensive list of adverse effects. Diphenhydramine is used to treat sneezing, runny nose, watery eyes, hives, skin rash, itching, and other cold or allergy symptoms. You may report them to the Use these dosage charts for infants and children under 12 years old:The easiest way to lookup drug information, identify pills, check interactions and set up your own personal medication records. These are not all of the side effects that may occur. Applies to diphenhydramine: oral capsules and tablets, parenteral injectionSide effects include:Sedation, sleepiness, dizziness, disturbed coordination, epigastric distress, thickening of bronchial secretions. COMMON side effects. Dizziness. The most commonly reported side effects included somnolence, dizziness, and incoordination.1. Diphenhydramine is an antihistamine that reduces the effects of natural chemical histamine in the body. Histamine can produce symptoms of sneezing, itching, watery eyes, and runny nose. Drowsiness. Moderate Potential Hazard, Low plausibility. O 0Always consult your healthcare provider to ensure the information displayed on this page applies to your personal circumstances.Some side effects may not be reported. Pfizer U.S. Pharmaceuticals Group, New York, NY. How the study uses the data? Benadryl (diphenhydramine)." "Product Information. Corticosteroids can raise blood glucose level by antagonizing the action and suppressing the secretion of insulin, which results in inhibition of peripheral glucose uptake and increased … If experienced, these tend to have a Less Severe expression. This copyrighted material has been downloaded from a licensed data provider and is not for distribution, except as may be authorized by the applicable terms of use.Things to remember when you fill your prescription.WebMD does not provide medical advice, diagnosis or treatment. Applies to: Abnormal Glucose Tolerance, Diabetes Mellitus. Call your doctor or get medical help if any of these side effects or any other side effects bother you or do not go away: Feeling sleepy. 3. If you have questions about side effects, call your doctor. 4. The study is based on tetracycline hydrochloride and diphenhydramine hydrochloride (the active ingredients of Tetracycline hydrochloride and Benadryl, respectively), and Tetracycline hydrochloride and Benadryl (the brand names). An Increase In The Thickness Of Lung Secretions. More frequently reported side effects include: sedated state and thickening of bronchial secretions. If experienced, these tend to have a Less Severe expressionIf experienced, these tend to have a Less Severe expressionIf experienced, these tend to have a Severe expressionIf experienced, these tend to have a Less Severe expressionSelected from data included with permission and copyrighted by First Databank, Inc. Learn more . 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