Suggest Treatment For Twitching And Spasms Of Cheek And Lips

My dad - 67 yrs old, height 5 feet 8 inches, weighing 82 kgs- has HFS since 2 yrs, that started with right eye twitching and now involves spasms of the right cheek involving right side of the lips as well. The frequency of spasms is higher n the morning after he wakes up and relatively lower in the evenings. He has hypertension since 2 yrs that is kept normal with a single dose of 5 mg amlodipin salt. Oral medication since last 1.5 yrs has not helped and the only option seems to be either surgery OR botox treatment. Given the risk and availability of treatment at Bangalore India, we prefer to opt for Botox treatment. Can you please advise the duration botox is expected to remain effective for... and preferably the best place to get this done at Bangalore India... and any other advise in this case. Thanks & God bless you.