Final answer:
The primary therapeutic effect of digoxin (Lanoxin) is increased force of contraction. Digoxin is a medication used to treat heart failure and certain heart rhythm problems.
Step-by-step explanation:
The primary therapeutic effect of digoxin (Lanoxin) is increased force of contraction. Digoxin is a medication used to treat heart failure and certain heart rhythm problems. It works by increasing the force of contraction of the heart muscle, leading to improved cardiac output and circulation.