Doxycycline, 500 mg. 3x day for 10-15 days. This stuff is nasty on the tummy, but do take it as prescribed. It will knock out an early case of Lyme as it hasn’t yet become resistant to the spirochete. Don’t let it go because later on, the disease becomes chronic and very difficult to treat. (Think, on IV antibiotics, arthritis, knee and hip replacements, neurological effects, mood swings, loss of cognition, etc.) Yes, people HAVE died of it over many years.