Lynx... it's really easy to make. You can use either fresh herbs or dried. I usually use fresh, and essentially I just pack a gallon jug full of about half lemon balm tops and half peppermint tops. I fill the jar pretty full of the herbs, but don't pack them down hard.
Then I add enough 100 proof vodka to fill the jar, and push any herbs which are sticking out above the alcohol down under. Put a lid on it and stash it in a dark place for a month or so. (Actually, I usually make it in June when the herbs are lush and leafy, and before they bloom, and then leave it in the menstruum until fall when I have time to strain and bottle and label)
You can use dried herbs, but in that case, use 1 ounce of dried herbs (weight) to every 4 ounces (liquid measure) vodka.
It's an internal medicine. 1/2 to 1 teaspoon or so in a cup of tea will generally help mild spasms and let you keep working. (although, obviously, rest is an important part of healing sprains and strains!). A tablespoon at bedtime will relax you enough to sleep VERY well. Don't take it "straight"- dilute it in juice, or a relaxing herb tea (we like to add it to chamomile tea for bedtime)
Everyone reacts differently, so while it's not really a "sedating" combination, don't take it and drive or operate machinery until you're sure it doesn't affect your reflexes and reactions...
Summerthyme