What is a serious health consequence of adulterated drugs?

Adulterated drugs can lead to overdose as a serious health consequence because these substances may contain harmful or unexpected ingredients that dramatically alter their potency and effects. When a drug is adulterated, the actual dosage and concentration of the active ingredient can vary widely from what is intended, increasing the risk of taking a dangerously high amount. This can easily lead to overdose, particularly if a user is unaware of the true strength of the drug they are consuming.

The other options relate to various health issues but do not fully address the immediate and potentially fatal risks associated with overdosing on adulterated substances. Withdrawal symptoms and physical dependency are more related to the user's relationship with a substance over time rather than the direct effects of adulterated drugs. Increased demand for treatments highlights a systemic issue but does not speak to the direct physical health consequences caused by the consumption of adulterated drugs. Thus, overdose stands out as a critical and acute risk associated with these dangerous products.