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. Generic for Claritin* (Loratadine) is an antihistamine used to treat seasonal allergy symptoms such as runny nose, watery eyes, sneezing, itching, and hay fever. It is also used to treat hives. It works by reducing the effect of histamine, a natural chemical, in your body.