@GoodPersonEffed
"Propranolol is completely absorbed after oral administration and peak plasma concentrations occur 1 to 2 hours after dosing in fasting patients."
Propranolol 40 mg film-coated tablets - Summary of Product Characteristics (SmPC) by Accord Healthcare Limited
www.medicines.org.uk
" Propranolol is rapidly and completely absorbed, with peak plasma levels achieved about 1–3 hours after ingestion. More than 90% of the drug is found bound to plasma protein in the blood"
en.wikipedia.org
.
"After oral administration, propranolol is almost completely and rapidly absorbed from the gastrointestinal tract. However, because of the high first-pass metabolism and hepatic tissue binding, the absolute bioavailability is only about 30% and varies greatly between individuals. Peak plasma
concentration occurs one to two hours after administration"
(Frishman et al., 1979; Goodman & Gilman, 1985).
"Onset: 30 min" (table)
Now my personal observation. You can make this experiment as well. I immersed the full pill of Accord Propranolol in water and a crushed one separately. Propranolol does not seem very soluble in a form of tablets: full tablet and a crushed one did not dissolve even in half an hour. I see no big difference in results, if only we consider the fact that the more surface we have, the faster object with the same mass should dissolve. Same results go in a difference of 5-10 minutes. The hardest thing was to crush. 40 mg propranolol hydrochloride tablet is very small, I tried to crush a full tablet half an hour later and it was still very tough. I guess these tablets were not meant to be mixed and crushed, everything does our stomach. That's kind of an interesting observation.
The facts make me think that 30 minutes may not be enough and if we take a solution of SN and propranolol together, we won't feel a difference, the effect will be same as if we would take SN alone. Propranolol will make us die and potentiate SN but later, when we already passed out. I will check this as well, will try to find out when propranolol actually kicks in if it is crushed and consumed as it is. Your question made me curious.