title: In-vitro and in-vivo characterisation of two sustained release formulations for the antidepressant rolipram.
abstract: Using the pellet technology two sustained release formulations for (dl)-rolipram (ZK 62 711; CAS 61413-54-5) were developed and characterised by in-vitro dissolution tests and in a cross-over study in healthy male volunteers. In-vitro, 50% release was achieved within 2.5 h for formulation A and within 4 h for B. In-vivo, Cmax values of 4.4 +/- 0.9 ng/ml (A) and 2.1 +/- 0.8 ng/ml (B) were observed 2.8 +/- 0.8 h or 10.3 +/- 3.7 h after oral intake of 3 mg (dl)-rolipram. The terminal disposition half-life in the plasma was similar for both formulations (12 +/- 13 h and 11 +/- 2 h). Expectedly, the relative bioavailability of formulation B was lower compared to A (72%). Using the pellet technology, formulations with an intended release profile can be tailored to suit by mixing pellets with different release characteristics within one dosage form.
authors.affiliation: Schering Aktiengesellschaft, Department Pharmakokinetik, Berlin, Fed. Rep. of Germany.
authors.forename: M
authors.initials: M
authors.lastname: Pfeffer
authors.forename: N
authors.initials: N
authors.lastname: Sauerbrey
authors.forename: F
authors.initials: F
authors.lastname: Windt-Hanke
authors.forename: W
authors.initials: W
authors.lastname: Krause
mesh_terms: D000328:Adult; D000928:Antidepressive Agents / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D001682:Biological Availability; D002626:Chemistry, Pharmaceutical; D002851:Chromatography, High Pressure Liquid; D003692:Delayed-Action Preparations; D006207:Half-Life; D006801:Humans; D008297:Male; D011760:Pyrrolidinones / Q000008:administration & dosage* / Q000737:chemistry / Q000493:pharmacokinetics; D020889:Rolipram; D012995:Solubility
chemical_list: D000928:Antidepressive Agents; D003692:Delayed-Action Preparations; D011760:Pyrrolidinones; D020889:Rolipram