Yes it is. You can try Med-AssistTM online 30 days for free. Sign up using the 'Pay with Credit Card' option. Your creditcard will not be charged during the free trial period, but will be charged after 30 days when the trial ends. You can cancel your subscription anytime.
When using your Paypal account to sign up for the free trail you will be charged 1 cent. This is for technical reasons.