Hello. Loratadine Tablets Adverse Reactions:At the recommended dose of 10mg per day, no significant sedative effects were seen. Common adverse reactions include malaise, headache, drowsiness, dry mouth, gastrointestinal disturbances including nausea, gastritis, and rash. Rare adverse reactions include alopecia, allergic reactions, hepatic function abnormalities, tachycardia and palpitations.