The word bruh is slang. It can mean really or sometimes bro. Their  is the possessive pronoun of them or themselves.   They're is a contraction or shortening of 'they are'.   . Their means belonging to people or things previously mentioned or  easily identified (Your parents do not look similar, except for  their noses).
Claritin is an antihistamine. It blocks histamine, a chemical that causes congestion, itching, and other allergic reactions. Antihistamines can also make you sleepy, but Loratadine is a low-drowsiness version. Claritin D is a combination medicine for allergies. Loratadine (an antihistamine) prevents allergy symptoms like runny nose, sneezing, and itchy eyes or skin.
GENERIC NAME: LORATADINE - ORAL (lor-AT-a-deen) BRAND NAME(S): Claritin. Medication Uses | How To Use | Side Effects | Precautions | Drug Interactions | Overdose | Notes | Missed Dose | Storage. USES: This medication is an antihistamine that treats symptoms such as itching, runny nose, watery eyes, and sneezing from hay fever and other allergies. It is also used to relieve itching from hives.Loratadine does not prevent hives or prevent/treat a serious allergic reaction (e.g., anaphylaxis).