What is Cogentin time to peak plasma level expressed as a percentage?

• A. 29%
• B. 50%
• C. 75%
• D. 5%

Answer: (A)

Understanding Tmax expressed as a percentage helps you see where peak drug levels occur within the dosing interval. A value around 29% means the peak concentration is reached fairly early after dosing, well before the interval ends, which is typical for drugs designed to act promptly but avoid a late, large peak. This timing supports a balance between onset of effect and staying within the interval long enough to prevent excessive fluctuations. The other options would place peak later in the interval (midpoint or near the end) or almost immediately after dosing, which would lead to different fluctuation patterns and is less consistent with the usual pharmacokinetic behavior described here. So, 29% best reflects a relatively early peak within the dosing cycle.