A 13-year-old boy from Ohio died after he overdosed on a common allergy medication when he participated in a so-called TikTok challenge. Jacob Stevens, of Greenfield, took 12 to 14 Benadryl tablets, more than six times the recommended dosage, his family said. The over-the-counter drug’s generic name is diphenhydramine, an antihistamine. It’s typically used to treat…