@conservative Well....what I actually did was stop the drug for just ONE day, then switched to taking it in the morning rather than evening. The muscle ache symptom went away completely and I've been on the drug now for four months.

For people who get Tadalafil muscle ache symptoms (a small group), it shows up in two situations; when you take it and your body is at rest....or during intense exercise.

So, taking before bed was the issue for me. Thanks for offering some helpful advice...but not a pre-existing condition.