Holme's fave drink Seven Percent Solution?!

Question: I read on the back of a Holmes action figure that his fave drink was the "Seven Percent Solution." Anyone know what this drink was?

---

---

Answers: I read on the back of a Holmes action figure that his fave drink was the "Seven Percent Solution." Anyone know what this drink was?

---

---

Holmes used 7 percent solution and that solution was morphine.

---

---

It wasn't a drink; Holmes injected it.

---

---

---

---