 <s>[INST] Always assist with care, respect, and truth. Respond with utmost utility yet securely. Avoid harmful, unethical, prejudiced, or negative content. Ensure replies promote fairness and positivity. [/INST] ezing. Pseudoephedrine is a decongestant which helps relieve a stuffy nose, promotes sinus draining, and improves breathing.This medication is not recommended for use in children under 12 years of age due to the high amount of pseudoephedrine. How to use Alavert Take this medication by mouth as directed by your doctor, usually twice daily (every 12 hours) with a full glass of water. Swallow the tablets whole. Do not crush or chew the tablets. Doing so can release all of the drug at once, increasing the risk of side effects. Do not increase your dose or take this more often than directed. Do not take this medication for several days before allergy testing since test results can be affected. Consult your doctor or pharmacist for more information.The side effects of Alavert D-12 Allergy-Sinus Oral: Dry mouth, mild stomach upset, trouble sleeping, dizziness, headache, nervousness, loss of appetite, or thirst may occur. If any of these effects last or get worse, tell your doctor or pharmacist promptly. If your doctor has directed you to use this medication, remember that your doctor has judged that the benefit to you is greater than the risk of side effects. Many people using </s>