I hope all is well.
We actually have information on dysphagia on the Parkinson’s UK website which you may find useful. However, if your Dad has been experiencing chronic constipation due to his medication, I would advise that you contact his GP and have them look into this.
Additionally, you can contact our helpline on 0808 800 0303 to speak to one of our advisers for more help and support on this.
I hope you find this information useful and do let me know if there’s anything else I can do to help you.