The recommended dose of Benadryl (diphenhydramine) for adults is 1 to 2 tablets or capsules (each usually 25 mg) every 4 to 6 hours as needed. You should not take more than 6 doses in 24 hours, which equals a maximum of 300 mg daily. For children's dosing, it varies by age and form of Benadryl, so it's important to follow specific guidance on that. To summarize the adult dosage:

• 1 to 2 tablets/capsules (25 to 50 mg) every 4 to 6 hours
• Maximum 6 doses per day (300 mg total)
• Use with caution in older adults and those with certain medical conditions
• Do not exceed recommended limits due to risk of serious side effects

If using Benadryl for other purposes such as sleep, the dose might be different (e.g., 50 mg once at bedtime only). If you suspect an overdose or adverse reaction, seek medical help immediately.