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.
For people who have high blood pressure, Claritin is not likely to cause problems because it does not have a stimulatory effect on the heart and blood pressure. ClaritinÂ® (loratadine) is a non-prescription medication used to treat allergies and hives. It belongs to a group of medications known as non-sedating antihistamines.