Dosage form containing diphenhydramine and another drug

1. A pharmaceutical dosage form, wherein the dosage form comprises at least one of diphenhydramine and a pharmaceutically acceptable salt thereof in a first form or layer and at least one of diphenhydramine and a pharmaceutically acceptable salt thereof in a second form or layer, the first form or layer being a controlled release form or layer and the second form or layer being a controlled release form or layer that is different from the first form or layer and releases the at least one of diphenhydramine and a pharmaceutically acceptable salt thereof at least one of over a different period and at a different rate than the first form or layer.

2. The dosage form of claim 1 , wherein the second form or layer releases the at least one of diphenhydramine and a pharmaceutically acceptable salt thereof at least over a different period than the first form or layer.

3. The dosage form of claim 1 , wherein the second form or layer releases the at least one of diphenhydramine and a pharmaceutically acceptable salt thereof at least at a different rate than the first form or layer.

4. The dosage form of claim 1 , wherein at least one of the first and second forms or layers comprises diphenydramine hydrochloride.

5. The dosage form of claim 1 , wherein the dosage form comprises a solid dosage form.

6. The dosage form of claim 5 , wherein the dosage form is a tablet.

7. The dosage form of claim 5 , wherein the dosage form is a bi-layered tablet.

8. The dosage form of claim 1 , wherein the dosage form comprises two different controlled release forms or layers both of which comprise at least one of diphenhydramine and a pharmaceutically acceptable salt thereof and wherein at least one of the forms or layers comprises at least one additional drug.

9. The dosage form of claim 8 , wherein the at least one additional drug is selected from decongestants, antitussives, expectorants, mucus thinning drugs, and analgesics.

10. The dosage form of claim 8 , wherein the at least one additional drug comprises at least one decongestant.

11. The dosage form of claim 10 , wherein the at least one decongestant comprises at least one of phenylepherine and a pharmaceutically acceptable salt thereof.

12. The dosage form of claim 10 , wherein the at least one decongestant comprises at least one of pseudoephedrine and a pharmaceutically acceptable salt thereof.

13. The dosage form of claim 8 , wherein the at least one additional drug comprises at least one antitussive.

14. The dosage form of claim 13 , wherein the at least one antitussive comprises at least one drug selected from codeine, dihydrocodeine, hydrocodone, dextromethorphan, carbetapentane, and pharmaceutically acceptable salts thereof.

15. The dosage form of claim 8 , wherein the at least one second drug comprises at least one analgesic.

16. The dosage form of claim 15 , wherein the at least one analgesic comprises at least one drug selected from acetaminophen, aspirin, ibuprofen, naproxen, morphine, and pharmaceutically acceptable salts thereof.

17. The dosage form of claim 8 , wherein the at least one second drug comprises at least one expectorant.

18. The dosage form of claim 16 , wherein the at least one expectorant comprises guaifenesin.

19. The dosage form of claim 8 , wherein the dosage form provides a plasma concentration within a therapeutic range of the at least one additional drug over a period which is coextensive with at least 70% of a period over which the dosage form provides a plasma concentration within a therapeutic range of diphenhydramine.

20. The dosage form of claim 19 , wherein the at least one additional drug is selected from decongestants, antitussives, expectorants, mucus thinning drugs, and analgesics.

21. The dosage form of claim 19 , wherein the dosage form comprises diphenhydramine hydrochloride.

22. The dosage form of claim 19 , wherein the at least one additional drug comprises at least one antitussive.

23. The dosage form of claim 22 , wherein the at least one antitussive comprises at least one drug selected from codeine, dihydrocodeine, hydrocodone, dextromethorphan, carbetapentane, and pharmaceutically acceptable salts thereof.

24. The dosage form of claim 19 , wherein the at least one additional drug comprises at least one decongestant.

25. The dosage form of claim 24 , wherein the at least one decongestant comprises at least one drug selected from phenylepherine, pseudoephedrine, and pharmaceutically acceptable salts thereof.

26. The dosage form of claim 19 , wherein the at least one additional drug comprises at least one analgesic.

27. The dosage form of claim 19 , wherein the at least one additional drug comprises at least one expectorant.

28. The dosage form of claim 27 , wherein the at least one expectorant comprises guaifenesin.

29. The dosage form of claim 19 , wherein a plasma half-life of the at least one additional drug is shorter or longer than a plasma half-life of diphenhydramine by at least 2 hours.

30. The dosage form of claim 19 , wherein a plasma half-life of the at least one additional drug is shorter or longer than a plasma half-life of diphenhydramine by at least 4 hours.

31. The dosage form of claim 19 , wherein the period of a plasma concentration within the therapeutic range of the at least one additional drug is coextensive with at least 80% of the period of a plasma concentration within the therapeutic range of diphenhydramine.

32. The dosage form of claim 19 , wherein the period of a plasma concentration within the therapeutic range of the at least one additional drug is coextensive with at least 90% of the period of a plasma concentration within the therapeutic range of diphenhydramine.

33. The dosage form of claim 19 , wherein the dosage form comprises a tablet.

34. The dosage form of claim 33 , wherein the tablet is a bi-layered tablet.

35. A bi-layered tablet which comprises a first layer and a second layer, the first layer being a controlled release layer which comprises at least one of diphenhydramine and a pharmaceutically acceptable salt thereof and the second layer being a controlled release layer which comprises at least one of diphenhydramine and a pharmaceutically acceptable salt thereof and releases the at least one of diphenhydramine and a pharmaceutically acceptable salt thereof at least one of over a different period and at a different rate than the first layer.

36. The bi-layered tablet of claim 35 , wherein the second layer releases the at least one of diphenhydramine and a pharmaceutically acceptable salt thereof at least over a different period than the first layer.

37. The bi-layered tablet of claim 35 , wherein the second layer releases the at least one of diphenhydramine and a pharmaceutically acceptable salt thereof at least at a different rate than the first layer.

38. The bi-layered tablet of claim 35 , wherein at least one of the first and second layers comprises diphenydramine hydrochloride.

39. The bi-layered tablet of claim 35 , wherein at least one of the first and second layers comprises at least one additional drug.

40. The bi-layered tablet of claim 39 , wherein the at least one additional drug is selected from decongestants, antitussives, expectorants, mucus thinning drugs, and analgesics.

41. The bi-layered tablet of claim 39 , wherein the at least one additional drug comprises at least one decongestant.

42. The bi-layered tablet of claim 41 , wherein the at least one decongestant comprises at least one of phenylepherine and a pharmaceutically acceptable salt thereof.

43. The bi-layered tablet of claim 41 , wherein the at least one decongestant comprises at least one of pseudoephedrine and a pharmaceutically acceptable salt thereof.

44. The bi-layered tablet of claim 39 , wherein the at least one additional drug comprises at least one antitussive.

45. The bi-layered tablet of claim 44 , wherein the at least one antitussive comprises at least one drug selected from codeine, dihydrocodeine, hydrocodone, dextromethorphan, carbetapentane, and pharmaceutically acceptable salts thereof.

46. The bi-layered tablet of claim 39 , wherein the at least one second drug comprises at least one analgesic.

47. The bi-layered tablet of claim 46 , wherein the at least one analgesic comprises at least one drug selected from acetaminophen, aspirin, ibuprofen, naproxen, morphine, and pharmaceutically acceptable salts thereof.

48. The bi-layered tablet of claim 39 , wherein the at least one second drug comprises at least one expectorant.

49. The bi-layered tablet of claim 48 , wherein the at least one expectorant comprises guaifenesin.

50. The bi-layered tablet of claim 39 , wherein the bi-layered tablet provides a plasma concentration within a therapeutic range of the at least one additional drug over a period which is coextensive with at least 70% of a period over which the bi-layered tablet provides a plasma concentration within a therapeutic range of diphenhydramine.

51. The bi-layered tablet of claim 50 , wherein the at least one additional drug is selected from decongestants, antitussives, expectorants, mucus thinning drugs, and analgesics.

52. The bi-layered tablet of claim 50 , wherein the dosage form comprises diphenhydramine hydrochloride.

53. The bi-layered tablet of claim 50 , wherein the at least one additional drug comprises at least one antitussive.

54. The bi-layered tablet of claim 53 , wherein the at least one antitussive comprises at least one drug selected from codeine, dihydrocodeine, hydrocodone, dextromethorphan, carbetapentane, and pharmaceutically acceptable salts thereof.

55. The bi-layered tablet of claim 50 , wherein the at least one additional drug comprises at least one decongestant.

56. The bi-layered tablet of claim 55 , wherein the at least one decongestant comprises at least one drug selected from phenylepherine, pseudoephedrine, and pharmaceutically acceptable salts thereof.

57. The bi-layered tablet of claim 50 , wherein the at least one additional drug comprises at least one analgesic.

58. The bi-layered tablet of claim 50 , wherein the at least one additional drug comprises at least one expectorant.

59. The bi-layered tablet of claim 58 , wherein the at least one expectorant comprises guaifenesin.

60. The bi-layered tablet of claim 50 , wherein a plasma half-life of the at least one additional drug is shorter or longer than a plasma half-life of diphenhydramine by at least 2 hours.

61. The bi-layered tablet of claim 50 , wherein a plasma half-life of the at least one additional drug is shorter or longer than a plasma half-life of diphenhydramine by at least 4 hours.

62. The bi-layered tablet of claim 50 , wherein the period of a plasma concentration within the therapeutic range of the at least one additional drug is coextensive with at least 80% of the period of a plasma concentration within the therapeutic range of diphenhydramine.

63. The bi-layered tablet of claim 50 , wherein the period of a plasma concentration within the therapeutic range of the at least one additional drug is coextensive with at least 90% of the period of a plasma concentration within the therapeutic range of diphenhydramine.

64. The bi-layered tablet of claim 35 , wherein the first layer comprises only diphenhydramine or a pharmaceutically acceptable salt thereof as an active ingredient.

65. The bi-layered tablet of claim 50 , wherein the first layer comprises only diphenhydramine hydrochloride as an active ingredient.

66. The bi-layered tablet of claim 35 , wherein the first layer comprises from about 10 mg to about 300 mg of diphenhydramine hydrochloride or an equivalent amount of at least one other pharmaceutically acceptable salt of diphenhydramine.

67. The bi-layered tablet of claim 66 , wherein the second layer comprises from about 2.5 mg to about 300 mg of diphenhydramine hydrochloride or an equivalent amount of at least one other pharmaceutically acceptable salt of diphenhydramine.

68. The bi-layered tablet of claim 67 , wherein the second layer comprises one or more of (i) from about 1 mg to about 120 mg of phenylepherine hydrochloride or an equivalent amount of at least one other pharmaceutically acceptable salt of phenylepherine; (ii) from about 1 mg to about 240 mg of pseudoephedrine hydrochloride or an equivalent amount of at least one other pharmaceutically acceptable salt of pseudoephedrine; (iii) from about 1 mg to about 120 mg of carbetapentane citrate or an equivalent amount of at least one other pharmaceutically acceptable salt of carbetapentane; (iv) from about 1 mg to about 120 mg of codeine phosphate or an equivalent amount of at least one other pharmaceutically acceptable salt of codeine; (v) from about 1 mg to about 30 mg of dihydrocodeine bitartrate or an equivalent amount of at least one other pharmaceutically acceptable salt of dihydrocodeine; (vi) from about 1 mg to about 20 mg of hydrocodone bitartrate or an equivalent amount of at least one other pharmaceutically acceptable salt of hydrocodone; (vii) from about 10 mg to about 1000 mg of acetaminophen; and (viii) from about 10 mg to about 1500 mg of guaifenesin.