How should this be treated?

Patient's question:

Has a nasal voice (previously diagnosed with rhinitis). Two weeks ago, there was a slight cough with less than ten coughs a day. Took Cefalexin and Triptorelin for a week, and Cefixime for three days, along with Huanghuanglian. Stopped all medication the day before yesterday, but there's a bit of coughing again, and the nasal voice is still there. Don't want to give him more medicine again. Is it serious? Will it improve on its own? What kind of assistance is needed: detailed clarification

Doctor's answer:

It is very likely that the symptoms are caused by rhinitis. I recommend adopting a dietary therapy to treat this condition. As long as the treatment is timely, I believe your child will definitely get better.
Treatment Suggestions:
The formula is composed of the following ingredients:
- Astragalus root 30g
- Coix seed 30g
- Polygonum multiflorum 15g
- Sambucus 15g
- Poria 10g
- Polygonum multiflorum 10g
- Cuscuta chinensis 10g
- Jujube 10g
- Licorice 6g
Preparation and Usage:
Boil the above ingredients with gentle heat three times, and extract 500ml of liquid. Divide it into three doses and take once daily. One dose per day constitutes a course of treatment, with a total of two courses.