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, perhaps best known by its brand name Claritin, is a popular over-the-counter antihistamine for people. It can also be given safely to dogs under veterinary supervision. As an antihistamine, loratadineâs main function is to counteract the effects of histamine in an allergic person or animal. Histamine is a chemical that an allergic dogâs immune system creates in response to a trigger from an allergen (such as pollen, food ingredients or flea saliva).