Halbmond (Diphenhydramine Hydrochloride)

Halbmond is intended for temporary relief of several common conditions related to histamine release. It may be used by adults and children as directed on the package.

• Relief of allergic rhinitis symptoms such as sneezing, itching, and runny nose.
• Management of urticaria (hives) and associated skin itching.
• Alleviation of common cold symptoms, including nasal congestion and watery eyes.
• Short‑term aid for occasional insomnia when non‑prescription sleep support is needed.
• Treatment of mild itching caused by insect bites or minor skin irritations.

Side effects of diphenhydramine can vary in frequency and severity. Most users experience mild, transient reactions, while rare events may require medical attention.

Common

• Drowsiness or sedation
• Dry mouth, throat, or nasal passages
• Dizziness or light‑headedness
• Blurred vision
• Constipation or difficulty urinating
• Nausea or upset stomach

Serious

• Rapid or irregular heartbeat
• Severe allergic reaction (rash, swelling, difficulty breathing)
• Confusion or hallucinations, especially in older adults
• Persistent urinary retention
• Severe constipation or bowel obstruction

Before using Halbmond, consider the following safety points to minimize risks.

• Avoid use if you have known hypersensitivity to diphenhydramine or other antihistamines.
• Use caution when operating machinery or driving, as drowsiness can impair coordination.
• Consult a healthcare professional before use during pregnancy, lactation, or in children under the recommended age.
• Individuals with glaucoma, enlarged prostate, or urinary retention should discuss use with a physician.
• Limit use to short periods; prolonged daily use may increase the risk of tolerance and side effects.
• Do not combine with alcohol or other central nervous system depressants without medical advice.

Diphenhydramine can interact with several medication classes, affecting its safety and effectiveness.

Avoid

• Other sedating antihistamines, benzodiazepines, or opioids, which may intensify drowsiness.
• Monoamine oxidase inhibitors (MAOIs) or recent MAOI therapy, due to potential additive anticholinergic effects.
• Alcohol and illicit substances that depress the central nervous system.

Use with caution

• Anticholinergic drugs (e.g., atropine, scopolamine) that may increase dry mouth and urinary retention.
• Antidepressants, especially tricyclics, which can enhance cardiac effects.
• Antacids containing aluminum or magnesium, which may affect absorption.
• Over‑the‑counter cough or cold preparations that also contain antihistamines.