I gave her a very powerful narcotic, I'm sure it will be effective soon.

4 seconds sound clip from the The Black Cat (1934) movie soundboard.

You can hear this line at 00:20:33.299 in the Blu-ray version of the movie.

Quote context

[...]

- He is the unfortunate victim of one of the commoner phobias, but in an extreme form. He has an intense, and all-consuming horror of cats.

- Come, darling, you must go back to bed. You're not strong enough.

- He is quite right. You had a severe shock. You must sleep.

- Good night, gentlemen.

- Forgive my presumption, but I must emphasize the extreme importance of Mrs. Alison having complete quiet sleep.

- I gave her a very powerful narcotic, I'm sure it will be effective soon.

- Her condition is not sufficiently serious to be cause for alarm, but it is decidedly delicate. Rest is the important thing.

- What curious changes it made in her. You must have noticed it?

- It is perhaps the narcotic. Hyoscine affects certain people very oddly. One cannot be sure.

- Sometimes these cases take strange forms.

[...]