Displaying 3 results of Pseudoephedrine Impurities Pseudoephedrine is a commonly used drug for nasal congestion. However, during the manufacturing process, impurities can be introduced which can be harmful to human health. These impurities can include residual solvents, heavy metals, and other organic compounds. Controlling and monitoring these impurities is essential for ensuring the safety and efficacy of pseudoephedrine products.