Final answer:
Atropine may be ineffective in treating nerve agent poisoning if the exposure is extensive or if there is a delay in administering the drug. Other synthetic anticholinergic drugs may be more effective in these cases. Consideration of specific conditions is important when determining the effectiveness of atropine.
Step-by-step explanation:
Atropine may be ineffective in certain situations. For example, it may not be effective in treating nerve agent poisoning if the exposure is extensive or if there is a delay in administering the drug. Other synthetic anticholinergic drugs, such as biperiden, may be more effective in these cases. Additionally, atropine is not effective in counteracting the central symptoms of nerve agent poisoning as well as some other drugs that can pass the blood-brain barrier more effectively. It is important to consider these factors when determining the effectiveness of atropine in treating specific conditions.