Is it true or false that Aclidinium has a short duration of action?

Aclidinium is classified as a long-acting anticholinergic agent, primarily used in the management of chronic obstructive pulmonary disease (COPD). Its duration of action is typically around 12 hours, allowing for twice-daily dosing to effectively control symptoms. This extended duration of action is beneficial in maintaining bronchodilation throughout the day. Therefore, stating that aclidinium has a short duration of action is inaccurate, making the correct response that it is false.

In contrast, the other options would not apply since aclidinium is specifically recognized for its prolonged effects rather than a brief duration or variances in effect based on dosage. Hence, the conclusion that aclidinium has a long duration of action is well-founded in its pharmacological profile.