Final answer:
The muscarinic blocker used for motion sickness is scopolamine, which is administered through a transdermal patch. Another option is antihistamines like dimenhydrinate.
Step-by-step explanation:
The muscarinic blocker commonly used for prevention and treatment of motion sickness is scopolamine. It is administered through a transdermal patch, which regulates the release of the drug and keeps the concentration low to avoid potential dangers. Another option for motion sickness treatment is the use of antihistamines like dimenhydrinate.