Is there any effective treatment of autism in homeopathy?

Difficult issues: These are difficult cases, but in conjunction with other professionals working together, yes there can be improvement. These children need a wide variety of supports & care, including nutritional, behavioral, educational, and medical. I suggest you read "the impossible cure" by dr. Amy lansky. She recounts the story of her own son's treatment with homeopathy, after conventional efforts failed.

No: there are no homeopathic substances that have been shown in double blind cross over studies to have a significant effect on autism.