Drugs that increase the activity of metabolizing enzymes in the liver cause:

Drugs that increase the activity of metabolizing enzymes in the liver are referred to as enzyme inducers. When these drugs are administered, they enhance the ability of the liver to metabolize other substances, which can lead to a faster breakdown of these substances in the body. This process is beneficial in some cases, as it can help eliminate drugs more rapidly and reduce their effects.

For instance, if a patient is taking a drug that induces liver enzymes, the therapeutic effects of another concurrently administered drug that is metabolized by the same enzymes may be diminished because it is being metabolized at an increased rate. This concept is important for understanding drug interactions and ensuring that medications remain effective.

Renal secretion and glomerular filtration pertain to the kidney's role in drug excretion and are not directly related to the activity of liver enzymes. Enzyme inhibition refers to a decrease in the activity of these enzymes, which is contrary to what is described in the question. Thus, the concept of enzyme induction is key to understanding the effects of certain drugs on liver metabolism.