 <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]  this product when it is expired or no longer needed. Consult your pharmacist or local waste disposal company.The uses of Plexion NS Topical: This medication is used to treat certain scalp conditions (dandruff, seborrhea). These scalp problems can sometimes be worsened by bacteria on the skin. This medication works by stopping the growth of certain skin bacteria. Sodium sulfacetamide belongs to a class of drugs known as sulfa antibiotics.Do not use this medication in children under 2 months old. How to use Plexion NS 9.8 % Shampoo Acne Antibiotics This medication is for use on the hair and scalp only. Shake the bottle well before using. Wet hair and scalp with water. Apply this product to wet hair and massage it over your entire scalp until it forms a lather. Rinse the medication off completely. Use this medication as directed by your doctor, usually at least 2 times a week. Avoid getting this medication in the eyes, nose, or mouth. If you do get medication into these areas, rinse with plenty of water. How often you use this medication is based on your medical condition and response to treatment. Use this medication regularly to get the most benefit from it. Do not use large amounts of this medication, </s>