Pharmacology Which of the following best describes the drug phenomenon at pKa=pH? A Drug exists as 50% ionized and 50% unionized B Drug exists as 25% ionized and 75% unionized C Drug exists as 75% ionized and 25% unionized D Drug is completely (100%) Ionized 💡 Explanation Which of the following best describes the drug phenomenon at pKa=pH? ✓ Correct Answer: A. Drug exists as 50% ionized and 50% unionized