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.
Claritin-D has Loratadine 5mg (antihistamine) /Pseudoephedrine HCL 120mg (decongestant). Claritin D24 has Loratadine 10 mg / Pseudoephedrine HCI 240 mg. Make sure it IS the 24 hour tablet she is taking. Sudafed 24hr has only Pseudoephedrine HCI 240 mg--double dose of what's in Claritin.