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.
Loratadine uses: Claritin is a medication that uses antihistamines to treat the symptoms of allergic reactions. Loratadine uses specific pathways to reduce symptoms such as itching, runny nose, sneezing, itchy mouth or throat, and watery eyes, but is not an effective treatment for serious allergic reactions - as in anaphylaxis.