Final answer:
An individual can purchase up to 3.6 grams of pseudoephedrine through the mail in a 30-day period, as regulated by the Combat Methamphetamine Epidemic Act of 2005.
Step-by-step explanation:
The amount of pseudoephedrine that someone can purchase over the mail in 30 days depends on several factors such as the country, state, and local regulations. In the United States, federal law limits an individual to purchasing a maximum of 3.6 grams of pseudoephedrine per day and 9 grams in a 30-day period. State laws may impose additional restrictions.
These measures aim to curb the diversion of pseudoephedrine for illegal purposes while ensuring responsible use for legitimate medical needs. It's crucial for individuals to adhere to these regulations, and pharmacies often track purchases through a real-time electronic monitoring system to enforce these limits and prevent abuse.
It's important to note that purchasing and using pseudoephedrine should always be done in accordance with medical advice and guidelines, as it can have side effects and interactions with other medications.